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highscalability.com

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Free website and domain report on highscalability.com

Last Updated: 27th September, 2020 Update Now
Overview

Snoop Summary for highscalability.com

This is a free and comprehensive report about highscalability.com. The domain highscalability.com is currently hosted on a server located in United States with the IP address 172.67.173.147, where the local currency is USD and English is the local language. Highscalability.com has the potential to be earning an estimated $16 USD per day from advertising revenue. If highscalability.com was to be sold it would possibly be worth $11,336 USD (based on the daily revenue potential of the website over a 24 month period). Highscalability.com receives an estimated 5,444 unique visitors every day - a huge amount of traffic! This report was last updated 27th September, 2020.

About highscalability.com

Site Preview: highscalability.com highscalability.com
Title: High Scalability | Building bigger, faster, more reliable websites.
Description: Weblog about database and other technology for highly scalable websites.
Keywords and Tags: business forums, technical
Related Terms: scalable
Fav Icon:
Age: Over 16 years old
Domain Created: 29th April, 2007
Domain Updated: 19th April, 2015
Domain Expires: 29th April, 2023
Review

Snoop Score

3/5 (Great!)

Valuation

$11,336 USD
Note: All valuation figures are estimates.

Popularity

High
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 100,656
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 5,444
Monthly Visitors: 165,698
Yearly Visitors: 1,987,060
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $16 USD
Monthly Revenue: $472 USD
Yearly Revenue: $5,663 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: highscalability.com 19
Domain Name: highscalability 15
Extension (TLD): com 3
Expiry Check:

Page Speed Analysis

Average Load Time: 2.23 seconds
Load Time Comparison: Faster than 38% of sites

PageSpeed Insights

Avg. (All Categories) 47
Performance 50
Accessibility 53
Best Practices 64
SEO 64
Progressive Web App 4
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: http://highscalability.com/
Updated: 27th September, 2020

2.98 seconds
First Contentful Paint (FCP)
33%
43%
24%

0.00 seconds
First Input Delay (FID)
97%
2%
1%

Simulate loading on desktop
50

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for highscalability.com. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Cumulative Layout Shift — 0.056
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Opportunities

Properly size images — Potential savings of 123 KiB
Images can slow down the page's load time. Highscalability.com should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147033
125537
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Highscalability.com should consider minifying CSS files.
Minify JavaScript — Potential savings of 8 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Highscalability.com should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://highscalability.com/universal/yui/element/element.js?CE=75
7038
4765
http://highscalability.com/universal/yui/selector/selector.js?CE=75
5902
3288
Efficiently encode images — Potential savings of 35 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
36610
27191
https://live.staticflickr.com/65535/50366779832_a2b869f0a8.jpg
67033
9036
Serve images in next-gen formats — Potential savings of 248 KiB
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147033
74569
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
36610
30248
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
33369
28265
https://live.staticflickr.com/65535/50366779832_a2b869f0a8.jpg
67033
26709
https://live.staticflickr.com/65535/50171516316_8b0e46b191.jpg
49850
23090
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
20240
16462
https://live.staticflickr.com/65535/50338160242_365f87b3fc.jpg
51910
16152
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
19186
15062
https://live.staticflickr.com/65535/50346304346_e1ab92a728_z.jpg
33663
13061
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
13978
9856
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 320 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
http://highscalability.com/
315.71
Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. Highscalability.com should avoid multiple or unnecessary page redirects.
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Highscalability.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 25 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://static.xx.fbcdn.net/rsrc.php/v3/yj/r/io13bVO2OlV.js?_nc_x=Ij3Wp8lg5Kz
7346
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
7147
https://static.xx.fbcdn.net/rsrc.php/v3/yJ/r/MC1KO9uDcO3.js?_nc_x=Ij3Wp8lg5Kz
6608
https://static.xx.fbcdn.net/rsrc.php/v3/yl/r/EbRX0I3ltA_.js?_nc_x=Ij3Wp8lg5Kz
4524
https://static.xx.fbcdn.net/rsrc.php/v3ikPV4/yl/l/en_US/j0ZaHCcAGBw.js?_nc_x=Ij3Wp8lg5Kz
31

Diagnostics

Avoid chaining critical requests — 18 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Highscalability.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures — 4 user timings
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
Name Type Start Time (Ms) Duration (Ms)
mark_pe
Mark
3307.854
mark_fs
Mark
3569.652
mark_qoes
Mark
3590.892
mark_ol
Mark
4231.63
Keep request counts low and transfer sizes small — 194 requests • 5,274 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
194
5400181
Script
58
3500022
Other
50
645132
Image
48
625746
Document
25
393330
Stylesheet
11
213173
Font
2
22778
Media
0
0
Third-party
150
5275146
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
High Scalability
Avoid large layout shifts — 5 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Snakes In A Facebook Datacenter TUESDAY, SEPTEMBER 22, 2020 AT 10:10AM   What…
0.033141841566438
advertise Login Register High Scalability RSS High Scalability Commen…
0.0091769339780485
RECENT POSTS Snakes in a Facebook Datacenter How did they send money in the o…
0.0076037452960973
Home Explain The Cloud Like I'm 10 All Time Favorites Real Life Architectures S…
0.0049048235449915
0:00 Unmute Additional Visual Settings Enter Fullscreen Click to watch on Faceb…
0.0021574344023324
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 12 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://static.xx.fbcdn.net/rsrc.php/v3/yl/r/EbRX0I3ltA_.js?_nc_x=Ij3Wp8lg5Kz
4864
304
https://static.xx.fbcdn.net/rsrc.php/v3/yj/r/io13bVO2OlV.js?_nc_x=Ij3Wp8lg5Kz
4158
142
Unattributable
296
133
http://platform.twitter.com/widgets.js
2450
123
https://static.xx.fbcdn.net/rsrc.php/v3izIB4/yj/l/en_US/bnP5ioYw-fE.js?_nc_x=Ij3Wp8lg5Kz
6870
122
https://static.xx.fbcdn.net/rsrc.php/v3ikPV4/yl/l/en_US/j0ZaHCcAGBw.js?_nc_x=Ij3Wp8lg5Kz
5390
118
https://static.xx.fbcdn.net/rsrc.php/v3/yj/r/io13bVO2OlV.js?_nc_x=Ij3Wp8lg5Kz
3390
113
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
3940
112
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
4059
99
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
709
93
https://static.xx.fbcdn.net/rsrc.php/v3iVCu4/yy/l/en_US/f5E0WzRWBqf.js?_nc_x=Ij3Wp8lg5Kz
6430
63
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
910
52
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Other

Network Requests
Below is a list of network requests that were made during page load.
URL Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://highscalability.com/
0
314.71300008707
14036
103807
200
text/html
Document
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
332.68900006078
625.36099995486
8768
44553
200
text/css
Stylesheet
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
332.90600008331
485.32900004648
1708
4592
200
text/css
Stylesheet
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
333.18199985661
488.03599993698
13746
36989
200
text/javascript
Script
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
333.57500005513
471.3810000103
3142
7581
200
text/javascript
Script
http://highscalability.com/universal/yui/json/json-min.js?CE=75
334.01499991305
376.61399994977
2718
4890
200
text/javascript
Script
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
334.5369999297
521.66599989869
5380
13827
200
text/javascript
Script
http://highscalability.com/universal/yui/selector/selector.js?CE=75
334.89300007932
380.79899991862
5902
21705
200
text/javascript
Script
http://highscalability.com/universal/yui/element/element.js?CE=75
335.18299995922
567.19599990174
7038
33056
200
text/javascript
Script
http://highscalability.com/universal/scripts/global.js?CE=75
335.60099988244
385.74799988419
13726
46629
200
text/javascript
Script
http://highscalability.com/universal/scripts/lightbox.js?CE=75
335.89500002563
368.69099992327
6409
32767
200
text/javascript
Script
http://highscalability.com/universal/scripts/api.js?CE=75
336.30099985749
380.13399997726
2379
6752
200
text/javascript
Script
http://highscalability.com/universal/scripts/base64.js?CE=75
336.66500006802
381.24500005506
1185
1642
200
text/javascript
Script
http://highscalability.com/universal/scripts/census.js?CE=75
336.91200008616
467.48999995179
797
543
200
text/javascript
Script
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
337.15899987146
381.69800001197
4683
12027
200
text/javascript
Script
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
337.53699995577
526.92099986598
5979
21566
200
text/javascript
Script
http://highscalability.com/universal/scripts/cookie-min.js
337.70300005563
490.08699995466
1926
4401
200
text/javascript
Script
http://highscalability.com/universal/scripts/eu-cookie-policy.js
338.11799995601
449.9609998893
1315
1682
200
text/javascript
Script
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591.52400004677
839.76099989377
570
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302
image/jpeg
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657.77499997057
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621
0
302
image/jpeg
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504
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658.87899999507
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image/png
http://highscalability.com/storage/highscalability%20ad.png
659.07899988815
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659.2009998858
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488
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302
image/png
http://highscalability.com/storage/scalability-track-highscalability.png
659.3199998606
901.38199995272
586
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302
image/png
http://highscalability.com/storage/stream.png
659.44000007585
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474
0
302
image/png
http://highscalability.com/storage/triplebyte125.png
659.79800000787
904.59099994041
483
0
302
image/png
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659.92800006643
767.62300007977
1398
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200
image/png
Image
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Script
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660.060999915
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Image
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Fetch
https://video-atl3-2.xx.fbcdn.net/v/t42.1790-2/10000000_330468391501228_4394395957071928096_n.mp4?_nc_cat=103&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfYXVkaW9fYWFjcF82NF9mcmFnXzJfYXVkaW8ifQ%3D%3D&_nc_ohc=_cH9kbC7twoAX85PW9O&_nc_ht=video-atl3-2.xx&oh=7ebb3b544f3d68d1e844bc7e124b9f9b&oe=5F706351&bytestart=130311&byteend=162905
4160.176999867
4181.7659998778
33061
32595
200
video/mp4
Fetch
https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2
4205.7570000179
4208.9680000208
11409
10788
200
font/woff2
Font
https://video-atl3-2.xx.fbcdn.net/v/t39.25447-2/10000000_967637003704539_7172303025706412821_n.mp4?_nc_cat=103&_nc_sid=5aebc0&efg=eyJ2ZW5jb2RlX3RhZyI6ImRhc2hfb2VwX2hxNF9mcmFnXzJfdmlkZW8ifQ%3D%3D&_nc_ohc=TMt_n8h2vPkAX-HWlNT&_nc_ht=video-atl3-2.xx&oh=cba34402b5237dc7744eb9a4e472ccdc&oe=5F975832&bytestart=265887&byteend=329957
4216.0650000442
4227.6669999119
64537
64071
200
video/mp4
Fetch
http://highscalability.com/universal/images/overlay-arrow-left.png
4242.067999905
4337.1299998835
962
507
200
image/png
Image
http://highscalability.com/universal/images/overlay-arrow-right.png
4242.4870000686
4332.9839999788
955
500
200
image/png
Image
http://highscalability.com/universal/images/manager/loading.gif
4247.9749999475
4353.8889999036
1705
1248
200
image/gif
Image
https://syndication.twitter.com/i/jot
4329.519999912
4384.9239998963
716
0
302
text/html
https://platform.twitter.com/jot.html
4385.4529999662
4397.4409999792
679
80
200
text/html
Document
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
349.59
8.733
363.35
9.082
660.961
40.528
701.506
44.616
748.242
25.166
777.955
16.851
795.491
15.974
817.432
7.465
827.718
6.284
837.687
23.358
863.257
6.46
874.171
12.157
886.349
8.913
895.706
6.965
907.407
14.361
922.292
10.773
940.445
17.216
958.637
9.627
969.241
8.786
978.131
5.255
983.713
7.203
992.158
8.403
1001.46
8.749
1011.53
18.826
1034.804
5.803
1041.502
5.925
1047.765
9.536
1059.032
9.501
1072.185
9.952
1082.159
7.543
1095.126
6.901
1104.079
10.009
1115.328
9.594
1126.482
5.227
1131.828
6.144
1140.295
34.369
1176.088
5.832
1182.197
8.224
1191.006
6.189
1231.451
7.212
1243.297
52.261
1295.576
8.209
1303.8
93.277
1397.271
7.556
1404.919
16.864
1421.936
21.851
1446.051
6.519
1452.944
5.719
1462.129
8.5
1472.246
18.133
1490.944
35.484
1527.622
7.439
1539.842
6.575
1550.514
6.931
1557.906
6.487
1564.536
18.133
1582.788
20.733
1603.682
15.392
1619.155
20.351
1641.178
14.3
1655.5
7.181
1664.152
18.959
1686.855
18.341
1705.338
23.58
1729.169
19.122
1748.432
24.642
1776.359
14.224
1793.822
142.453
1937.855
7.54
1947.002
6.212
1953.588
42.624
1996.441
112.785
2112.21
6.944
2119.385
9.387
2129.006
40.638
2169.772
19.996
2204.563
18.454
2224.471
6.393
2231.039
21.982
2283.328
9.48
2303.087
6.851
2310.634
29.321
2339.973
13.518
2353.57
304.363
2657.962
246.655
2905.894
5.598
2911.566
12.99
2929.322
12.434
2956.048
7.957
2964.047
8.7
2972.77
8.082
2981.246
8.429
2989.754
9.84
2999.782
8.052
3011.701
9.914
3021.693
8.269
3029.981
7.977
3037.985
7.268
3059.478
118.36
3181.548
8.175
3189.801
8.194
3201.231
14.789
3221.818
9.772
3236.139
11.38
3247.687
111.736
3361.889
9.526
3376.716
14.974
3394.895
132.755
3543.546
197.067
3749.086
63.282
3812.424
122.052
3940.896
13.103
3955.191
17.459
3973.021
15.202
3988.598
15.094
4004.17
16.394
4020.958
14.634
4036.138
16.869
4053.524
15.743
4069.29
6.516
4079.553
15.958
4101.721
14.175
4116.273
13.686
4130.37
15.385
4161.216
6.258
4172.41
8.248
4185.715
6.481
4192.336
8.428
4207.961
6.981
4214.999
25.427
4240.484
7.825
4250.378
9.564
4260.108
19.741
4281.212
8.756
4289.99
6.505
4325.325
13.329
4342.09
15.311
4432.602
9.136
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Metrics

First Contentful Paint — 1.0 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 2.0 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 2.2 s
The timing of the largest text or image that is painted.

Other

First Meaningful Paint — 1.0 s
The time taken for the primary content of the page to be rendered.
Estimated Input Latency — 80 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive highscalability.com as laggy when the latency is higher than 0.05 seconds.

Opportunities

Defer offscreen images — Potential savings of 243 KiB
Time to Interactive can be slowed down by resources on the page. Highscalability.com should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147033
147033
https://live.staticflickr.com/65535/50338160242_365f87b3fc.jpg
51910
51910
https://live.staticflickr.com/65535/50171516316_8b0e46b191.jpg
49850
49850
Remove unused CSS — Potential savings of 181 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Highscalability.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://static.xx.fbcdn.net/rsrc.php/v3/y9/l/0,cross/EvF5sqNo8xK.css?_nc_x=Ij3Wp8lg5Kz
82122
79766
https://static.xx.fbcdn.net/rsrc.php/v3/yS/l/0,cross/ovnNyn2n5II.css?_nc_x=Ij3Wp8lg5Kz
47890
47890
https://www.youtube.com/s/player/12237e3d/www-player-webp.css
48725
47183
https://static.xx.fbcdn.net/rsrc.php/v3/yc/l/0,cross/dcU8zd5coBw.css?_nc_x=Ij3Wp8lg5Kz
10576
10469

Diagnostics

Avoid an excessive DOM size — 1,270 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1,270
Maximum DOM Depth
SHOW DETAILS
27
Maximum Child Elements
SHOW DETAILS
18
Reduce JavaScript execution time — 1.7 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
Unattributable
495.674
73.888
0.212
http://platform.twitter.com/widgets.js
317.119
197.736
42.589
https://static.xx.fbcdn.net/rsrc.php/v3/yl/r/EbRX0I3ltA_.js?_nc_x=Ij3Wp8lg5Kz
308.203
276.947
6.214
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
275.538
92.836
151.765
http://highscalability.com/
273.057
5.461
1.994
https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fatscaleevents%2Fvideos%2F332024971479280%2F&show_text=0&width=560
246.991
97.752
15.69
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
219.494
209.824
3.856
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
118.811
59.672
35.263
https://static.xx.fbcdn.net/rsrc.php/v3ikPV4/yl/l/en_US/j0ZaHCcAGBw.js?_nc_x=Ij3Wp8lg5Kz
117.948
74.922
35.625
https://static.xx.fbcdn.net/rsrc.php/v3izIB4/yj/l/en_US/bnP5ioYw-fE.js?_nc_x=Ij3Wp8lg5Kz
117.422
60.765
44.565
https://static.xx.fbcdn.net/rsrc.php/v3/yj/r/io13bVO2OlV.js?_nc_x=Ij3Wp8lg5Kz
103.779
87.441
8.023
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html
88.834
21.298
12.081
https://static.xx.fbcdn.net/rsrc.php/v3iVCu4/yy/l/en_US/f5E0WzRWBqf.js?_nc_x=Ij3Wp8lg5Kz
63.192
28.41
28.017
https://www.youtube.com/embed/zMua0cuhFnc
60.613
14.307
8.272
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F21%2Fhow-did-they-send-money-in-the-olden-days-of-telegraphs.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
57.168
24.277
4.535
Minimize main-thread work — 3.7 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
1737.587
Other
566.37199999999
Script Parsing & Compilation
565.349
Style & Layout
292.677
Parse HTML & CSS
240.47
Garbage Collection
224.51
Rendering
104.022

Metrics

Time to Interactive — 6.1 s
The time taken for the page to become fully interactive.
Total Blocking Time — 640 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

First CPU Idle — 5.2 s
The time taken for the page's main thread to be quiet enough to handle input.
Max Potential First Input Delay — 300 ms
Users could experience a delay when interacting with the page.

Opportunities

Eliminate render-blocking resources — Potential savings of 1,000 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Highscalability.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
8768
110
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
1708
110
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
13746
190
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
3142
110
http://highscalability.com/universal/yui/json/json-min.js?CE=75
2718
110
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
5380
110
http://highscalability.com/universal/yui/selector/selector.js?CE=75
5902
70
http://highscalability.com/universal/yui/element/element.js?CE=75
7038
110
http://highscalability.com/universal/scripts/global.js?CE=75
13726
150
http://highscalability.com/universal/scripts/lightbox.js?CE=75
6409
110
http://highscalability.com/universal/scripts/api.js?CE=75
2379
70
http://highscalability.com/universal/scripts/base64.js?CE=75
1185
70
http://highscalability.com/universal/scripts/census.js?CE=75
797
70
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
4683
70
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
5979
70
http://highscalability.com/universal/scripts/cookie-min.js
1926
70
http://highscalability.com/universal/scripts/eu-cookie-policy.js
1315
70
Remove unused JavaScript — Potential savings of 1,725 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
461574
322101
https://static.xx.fbcdn.net/rsrc.php/v3izIB4/yj/l/en_US/bnP5ioYw-fE.js?_nc_x=Ij3Wp8lg5Kz
334276
311052
https://static.xx.fbcdn.net/rsrc.php/v3/yJ/r/MC1KO9uDcO3.js?_nc_x=Ij3Wp8lg5Kz
216373
208141
https://static.xx.fbcdn.net/rsrc.php/v3ikPV4/yl/l/en_US/j0ZaHCcAGBw.js?_nc_x=Ij3Wp8lg5Kz
218562
169178
https://static.xx.fbcdn.net/rsrc.php/v3iVCu4/yy/l/en_US/f5E0WzRWBqf.js?_nc_x=Ij3Wp8lg5Kz
170861
150823
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
99821
https://static.xx.fbcdn.net/rsrc.php/v3i_1H4/yv/l/en_US/pLSRweAZQwm.js?_nc_x=Ij3Wp8lg5Kz
110283
74084
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html
110969
59058
https://static.xx.fbcdn.net/rsrc.php/v3iLl54/yc/l/en_US/-mWVlOHSVJj.js?_nc_x=Ij3Wp8lg5Kz
58217
46026
https://static.xx.fbcdn.net/rsrc.php/v3/ye/r/6M3LJkJmdfv.js?_nc_x=Ij3Wp8lg5Kz
49550
43385
https://static.xx.fbcdn.net/rsrc.php/v3/yN/r/0WaXCP8Cmm_.js?_nc_x=Ij3Wp8lg5Kz
42603
37149
https://static.xx.fbcdn.net/rsrc.php/v3inZS4/yl/l/en_US/aLrr7hyDfvR.js?_nc_x=Ij3Wp8lg5Kz
53487
36205
https://static.xx.fbcdn.net/rsrc.php/v3/yj/r/io13bVO2OlV.js?_nc_x=Ij3Wp8lg5Kz
71667
34724
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
51216
34249
https://static.xx.fbcdn.net/rsrc.php/v3ixtB4/yd/l/en_US/oSh6GPiN659.js?_nc_x=Ij3Wp8lg5Kz
40547
33672
https://static.xx.fbcdn.net/rsrc.php/v3iLpP4/yh/l/en_US/cfUmoSlleQg.js?_nc_x=Ij3Wp8lg5Kz
37265
33038
http://platform.twitter.com/widgets.js
29476
27659
https://static.xx.fbcdn.net/rsrc.php/v3ikEj4/yM/l/en_US/w4L7xHtcqML.js?_nc_x=Ij3Wp8lg5Kz
28739
24197
https://static.xx.fbcdn.net/rsrc.php/v3i7M54/yA/l/en_US/LaYnun3p9Qf.js?_nc_x=Ij3Wp8lg5Kz
26591
21326

Diagnostics

Avoid enormous network payloads — Total size was 5,274 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
461574
https://static.xx.fbcdn.net/rsrc.php/v3izIB4/yj/l/en_US/bnP5ioYw-fE.js?_nc_x=Ij3Wp8lg5Kz
334276
https://static.xx.fbcdn.net/rsrc.php/v3ikPV4/yl/l/en_US/j0ZaHCcAGBw.js?_nc_x=Ij3Wp8lg5Kz
218562
https://static.xx.fbcdn.net/rsrc.php/v3/yJ/r/MC1KO9uDcO3.js?_nc_x=Ij3Wp8lg5Kz
216373
https://static.xx.fbcdn.net/rsrc.php/v3iVCu4/yy/l/en_US/f5E0WzRWBqf.js?_nc_x=Ij3Wp8lg5Kz
170861
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147291
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
Serve static assets with an efficient cache policy — 17 resources found
Highscalability.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
0
147291
https://static.doubleclick.net/instream/ad_status.js
900000
643
http://platform.twitter.com/widgets.js
1800000
29476
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
37176
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
33933
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
23446
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
20804
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
19751
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
14697
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
14541
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
11237
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
10027
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
7741
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
86400000
6765
https://www.youtube.com/yts/jsbin/fetch-polyfill-vfl6MZH8P/fetch-polyfill.js
691200000
3695
https://scontent-atl3-2.xx.fbcdn.net/v/t15.5256-10/s851x315/117752777_332031831478594_4506377047651458343_n.jpg?_nc_cat=102&_nc_sid=08861d&_nc_ohc=d3Kmzue3XGkAX93vgSv&_nc_ht=scontent-atl3-2.xx&oh=f5d4a947db1e1f34c71156bfa20ecd6c&oe=5F94CED8
1209600000
13465
https://scontent-atl3-2.xx.fbcdn.net/v/t1.0-1/cp0/p40x40/36996360_2116018252004601_4939364698530250752_o.jpg?_nc_cat=108&_nc_sid=dbb9e7&_nc_ohc=bsp1Eb4hpvAAX81Zkzz&_nc_ht=scontent-atl3-2.xx&_nc_tp=27&oh=b18f934fa03f3217fb19659edc74d016&oe=5F9420C8
1209600000
1730
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2
3.1869998201728
https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2
3.2110000029206
Reduce the impact of third-party code — Third-party code blocked the main thread for 360 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
3920937
221.181
SHOW DETAILS
588981
136.412
SHOW DETAILS
169382
4.063
SHOW DETAILS
215652
0
SHOW DETAILS
22778
0
SHOW DETAILS
5926
0
SHOW DETAILS
4081
0
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
URL Location
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
line: 5557
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
line: 3545
53

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of highscalability.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Highscalability.com may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Highscalability.com may provide relevant information that dialogue cannot, by using audio descriptions.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
TUESDAY, SEPTEMBER 22, 2020 AT 10:10AM
Todd Hoff | 1 Comment | Permalink | Share Article Print Article Email Article
in facebook
MONDAY, SEPTEMBER 21, 2020 AT 9:03AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
FRIDAY, SEPTEMBER 18, 2020 AT 9:05AM
Todd Hoff | 1 Comment | Permalink | Share Article Print Article Email Article
in hot links
FRIDAY, SEPTEMBER 18, 2020 AT 9:01AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in sponsored post
MONDAY, SEPTEMBER 14, 2020 AT 9:15AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
THURSDAY, SEPTEMBER 3, 2020 AT 8:29AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links
TUESDAY, SEPTEMBER 1, 2020 AT 8:02AM
Microsoft Azure
MySQL
Azure Database for MySQL vs. ScaleGrid MySQL on Azure
Kristi Anderson | Post a Comment | Permalink | Share Article Print Article Emai…
tagged Azure Database, Database Infrastructure, Database as a Service, MySQL Az…
in Azure, Database, MySQL, benchmark, databases
TUESDAY, AUGUST 4, 2020 AT 9:30AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links
FRIDAY, JULY 31, 2020 AT 9:25AM
Todd Hoff | 3 Comments | Permalink | Share Article Print Article Email Article
in hot links
WEDNESDAY, JULY 8, 2020 AT 3:22PM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links

Names and labels

`<frame>` or `<iframe>` elements do not have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Failing Elements
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
Image elements do not have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Failing Elements
img
img
img
img
img
img
img
img
Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Failing Elements
input
Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Tables and lists

Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
Failing Elements
InterviewCamp.io has hours of system design content. They also do live system d…
IP2Location is IP address geolocation service provider since 2002. The geolocat…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
64

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that highscalability.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
YUI 2
2.8.0r4
WebFont Loader
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.

Audits

Does not use HTTPS — 68 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://highscalability.com/
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
http://highscalability.com/universal/yui/json/json-min.js?CE=75
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
http://highscalability.com/universal/yui/selector/selector.js?CE=75
http://highscalability.com/universal/yui/element/element.js?CE=75
http://highscalability.com/universal/scripts/global.js?CE=75
http://highscalability.com/universal/scripts/lightbox.js?CE=75
http://highscalability.com/universal/scripts/api.js?CE=75
http://highscalability.com/universal/scripts/base64.js?CE=75
http://highscalability.com/universal/scripts/census.js?CE=75
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
http://highscalability.com/universal/scripts/cookie-min.js
http://highscalability.com/universal/scripts/eu-cookie-policy.js
http://highscalability.com/storage/HSBannerTrebuchet.jpg
http://highscalability.com/storage/ip2location-highscalability.png
http://highscalability.com/storage/Add%20AppSec%20Testing%20to%20Your%20CI%20Pipeline%20-%20B%20-%20125x125.jpg
http://highscalability.com/storage/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png
http://highscalability.com/storage/highscalability-ad-125x125-white%202.png
http://highscalability.com/storage/interviewcamp125.png
http://highscalability.com/storage/highscalability%20ad.png
http://highscalability.com/storage/125x125-javascript.png
http://highscalability.com/storage/scalability-track-highscalability.png
http://highscalability.com/storage/stream.png
http://highscalability.com/storage/triplebyte125.png
http://highscalability.com/universal/images/transparent.png
http://platform.twitter.com/widgets.js
http://farm3.static.flickr.com/2363/5781449767_54902da8a5_o.jpg
http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/22/snakes-in-a-facebook-datacenter.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/universal/images/core-resources/icons/smalllight/open-off-site.png
http://highscalability.com/universal/images/xml/feed-icon-12x12-orange.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/date.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/user-registered.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/comment.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/permalink.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/share.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/print.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/email.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/category.png
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/21/how-did-they-send-money-in-the-olden-days-of-telegraphs.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/stuff-the-internet-says-on-scalability-for-sep-18th-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/sponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/14/moving-hpc-to-the-cloud-a-guide-for-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/3/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/1/mysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/8/4/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/31/stuff-the-internet-says-on-scalability-for-july-31st-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/8/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/process/RecordHit?url=%2F&title=High%20Scalability%20-&viewportInnerHeight=940&viewportInnerWidth=1350&screenHeight=600&screenWidth=800&userAgent=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_14_6)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F84.0.4143.7%20Safari%2F537.36%20Chrome-Lighthouse&referrer=&pixelRatio=1&event=View
http://highscalability.com/universal/images/overlay-arrow-left.png
http://highscalability.com/universal/images/overlay-arrow-right.png
http://highscalability.com/universal/images/manager/loading.gif
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Registers an `unload` listener
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
URL
SHOW DETAILS
Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
URL Description
https://www.youtube.com/api/stats/qoe?event=streamingstats&cpn=VNhbkU9I4jliM8IY&ei=zztwX-WTB5iwhwbCo5CYCw&el=embedded&docid=zMua0cuhFnc&ns=yt&fexp=23744176%2C23748146%2C23804281%2C23839597%2C23843507%2C23856950%2C23857949%2C23862346%2C23880666%2C23882502%2C23884386%2C23894825%2C23895671%2C23897656%2C23911055%2C23915654%2C23915992%2C23916148%2C23918597%2C23919575%2C23921357%2C23928508%2C23930220%2C23934970%2C23935179%2C23942338%2C23944779%2C23945378%2C23947103%2C23947185%2C23947421%2C23947699%2C23948418%2C23948841%2C23949503%2C23952258%2C9406000%2C9449243&cl=333382973&seq=1&c=WEB_EMBEDDED_PLAYER&cver=20200925&cplayer=UNIPLAYER&cbr=Chrome&cbrver=84.0.4143.7&cos=Macintosh&cosver=10_14_6&vps=0.000:N,0.000:ER&cmt=0.000:0.000,0.000:0.000&error=0.000:html5.missingapi:0.000:nocodecs.1;a6s.0&vis=0.000:0&bh=0.000:0.000
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT.Inspector
64

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for highscalability.com. This includes optimizations such as providing meta data.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Mobile Friendly

Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of highscalability.com on mobile screens.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.
Image elements do not have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Failing Elements
img
img
img
img
img
img
img
img

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
4

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of highscalability.com. This includes details about web app manifests.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Fast and reliable

Page load is not fast enough on mobile networks — Interactive on simulated mobile network at 31.1 s
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.
Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 68 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://highscalability.com/
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
http://highscalability.com/universal/yui/json/json-min.js?CE=75
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
http://highscalability.com/universal/yui/selector/selector.js?CE=75
http://highscalability.com/universal/yui/element/element.js?CE=75
http://highscalability.com/universal/scripts/global.js?CE=75
http://highscalability.com/universal/scripts/lightbox.js?CE=75
http://highscalability.com/universal/scripts/api.js?CE=75
http://highscalability.com/universal/scripts/base64.js?CE=75
http://highscalability.com/universal/scripts/census.js?CE=75
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
http://highscalability.com/universal/scripts/cookie-min.js
http://highscalability.com/universal/scripts/eu-cookie-policy.js
http://highscalability.com/storage/HSBannerTrebuchet.jpg
http://highscalability.com/storage/ip2location-highscalability.png
http://highscalability.com/storage/Add%20AppSec%20Testing%20to%20Your%20CI%20Pipeline%20-%20B%20-%20125x125.jpg
http://highscalability.com/storage/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png
http://highscalability.com/storage/highscalability-ad-125x125-white%202.png
http://highscalability.com/storage/interviewcamp125.png
http://highscalability.com/storage/highscalability%20ad.png
http://highscalability.com/storage/125x125-javascript.png
http://highscalability.com/storage/scalability-track-highscalability.png
http://highscalability.com/storage/stream.png
http://highscalability.com/storage/triplebyte125.png
http://highscalability.com/universal/images/transparent.png
http://platform.twitter.com/widgets.js
http://farm3.static.flickr.com/2363/5781449767_54902da8a5_o.jpg
http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/22/snakes-in-a-facebook-datacenter.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/universal/images/core-resources/icons/smalllight/open-off-site.png
http://highscalability.com/universal/images/xml/feed-icon-12x12-orange.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/date.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/user-registered.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/comment.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/permalink.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/share.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/print.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/email.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/category.png
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/21/how-did-they-send-money-in-the-olden-days-of-telegraphs.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/stuff-the-internet-says-on-scalability-for-sep-18th-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/sponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/14/moving-hpc-to-the-cloud-a-guide-for-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/3/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/1/mysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=NMX6bkSApDUZh9isA5iqLJfj6IE%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/8/4/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/31/stuff-the-internet-says-on-scalability-for-july-31st-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/8/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/process/RecordHit?url=%2F&title=High%20Scalability%20-&viewportInnerHeight=940&viewportInnerWidth=1350&screenHeight=600&screenWidth=800&userAgent=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_14_6)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F84.0.4143.7%20Safari%2F537.36%20Chrome-Lighthouse&referrer=&pixelRatio=1&event=View
http://highscalability.com/universal/images/overlay-arrow-left.png
http://highscalability.com/universal/images/overlay-arrow-right.png
http://highscalability.com/universal/images/manager/loading.gif
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Does not redirect HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of highscalability.com on mobile screens.
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 40
Performance 30
Accessibility 53
Best Practices 57
SEO 54
Progressive Web App 4
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: http://highscalability.com/
Updated: 27th September, 2020

3.72 seconds
First Contentful Paint (FCP)
29%
39%
32%

0.24 seconds
First Input Delay (FID)
33%
63%
4%

Simulate loading on mobile
30

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for highscalability.com. This includes details about optimizing page load times which can result in a better user experience.

Opportunities

Properly size images
Images can slow down the page's load time. Highscalability.com should consider serving more appropriate-sized images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Highscalability.com should consider minifying CSS files.
Minify JavaScript — Potential savings of 8 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Highscalability.com should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://highscalability.com/universal/yui/element/element.js?CE=75
7038
4765
http://highscalability.com/universal/yui/selector/selector.js?CE=75
5902
3288
Efficiently encode images — Potential savings of 35 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
36610
27191
https://live.staticflickr.com/65535/50366779832_a2b869f0a8.jpg
67033
9036
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 300 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
http://highscalability.com/
298.017
Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. Highscalability.com should avoid multiple or unnecessary page redirects.
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. Highscalability.com should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 26 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://static.xx.fbcdn.net/rsrc.php/v3/yN/r/wvDpT6XuE2H.js?_nc_x=Ij3Wp8lg5Kz
7332
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
7157
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
7147
https://static.xx.fbcdn.net/rsrc.php/v3iHWn4/yR/l/en_US/897dxGauiai.js?_nc_x=Ij3Wp8lg5Kz
4496

Diagnostics

Avoid chaining critical requests — 18 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Highscalability.com should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures — 11 user timings
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
Name Type Start Time (Ms) Duration (Ms)
__v3
Measure
716.408
1009.05
⛏ display_done [6877062525394717109-0][phase all]
Measure
1725.658
237.19
⛏ first_response [display][phase 0]
Measure
1927.168
32.345
⛏ last_response [display][phase 1]
Measure
1961.743
0.645
display_done 6877062525394717109-0
Mark
1725.667
first_response display
Mark
1927.179
last_response display
Mark
1961.752
mark_pe
Mark
2422.397
mark_ol
Mark
2832.323
mark_fs
Mark
2991.933
mark_qoes
Mark
3025.185
Keep request counts low and transfer sizes small — 154 requests • 2,985 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
154
3056714
Script
39
1822655
Image
42
617842
Document
25
414081
Other
41
86606
Stylesheet
5
85479
Font
2
30051
Media
0
0
Third-party
110
2931201
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Fault tolerance is the property that enables a system to continue operating pro…
Avoid large layout shifts — 5 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Snakes In A Facebook Datacenter TUESDAY, SEPTEMBER 22, 2020 AT 10:10AM   What…
0.12832136564034
advertise Login Register High Scalability RSS High Scalability Commen…
0.034558247180744
RECENT POSTS Snakes in a Facebook Datacenter How did they send money in the o…
0.023541897806623
Home Explain The Cloud Like I'm 10 All Time Favorites Real Life Architectures S…
0.0097036367806127
Snakes In A Facebook Datacenter
0.0029924307425495
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 20 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
21910
718
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
15640
508
http://platform.twitter.com/widgets.js
6330
346
http://platform.twitter.com/widgets.js
21570
340
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
19470
327
https://static.xx.fbcdn.net/rsrc.php/v3/yi/r/-Sdm6B3Y1Mi.js?_nc_x=Ij3Wp8lg5Kz
9925
271
https://static.xx.fbcdn.net/rsrc.php/v3iHWn4/yR/l/en_US/897dxGauiai.js?_nc_x=Ij3Wp8lg5Kz
15120
268
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F3%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
4140
252
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
15388
252
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
20084
246
https://static.xx.fbcdn.net/rsrc.php/v3ikP64/yB/l/en_US/sQJScwTAeRA.js?_nc_x=Ij3Wp8lg5Kz
10196
237
Unattributable
1061
220
Unattributable
4740
168
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
19797
165
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
8340
160
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
20330
155
http://highscalability.com/
783
150
http://platform.twitter.com/widgets.js
3226
144
http://platform.twitter.com/widgets.js
2910
138
http://platform.twitter.com/widgets.js
3092
134
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Other

Network Requests
Below is a list of network requests that were made during page load.
URL Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://highscalability.com/
0
297.01999993995
14272
103807
200
text/html
Document
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
317.49499985017
674.26699982025
8768
44553
200
text/css
Stylesheet
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
317.7259999793
425.03899987787
1708
4592
200
text/css
Stylesheet
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
318.12399998307
506.7229999695
13746
36989
200
text/javascript
Script
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
318.50699987262
484.15899998508
3227
7581
200
text/javascript
Script
http://highscalability.com/universal/yui/json/json-min.js?CE=75
319.02799988165
445.35900000483
2718
4890
200
text/javascript
Script
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
319.45699988864
584.23199993558
5380
13827
200
text/javascript
Script
http://highscalability.com/universal/yui/selector/selector.js?CE=75
319.75299981423
370.00199989416
5902
21705
200
text/javascript
Script
http://highscalability.com/universal/yui/element/element.js?CE=75
320.12699986808
582.40800001658
7038
33056
200
text/javascript
Script
http://highscalability.com/universal/scripts/global.js?CE=75
320.40599989705
391.54199999757
13726
46629
200
text/javascript
Script
http://highscalability.com/universal/scripts/lightbox.js?CE=75
320.60400000773
449.00000002235
6409
32767
200
text/javascript
Script
http://highscalability.com/universal/scripts/api.js?CE=75
320.91999985278
388.30999983475
2379
6752
200
text/javascript
Script
http://highscalability.com/universal/scripts/base64.js?CE=75
321.12500001676
359.58599997684
1185
1642
200
text/javascript
Script
http://highscalability.com/universal/scripts/census.js?CE=75
321.47899991833
457.53499981947
797
543
200
text/javascript
Script
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
321.63899997249
363.34599996917
4683
12027
200
text/javascript
Script
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
321.7739998363
519.74199991673
5979
21566
200
text/javascript
Script
http://highscalability.com/universal/scripts/cookie-min.js
322.33599992469
457.06699998118
1841
4401
200
text/javascript
Script
http://highscalability.com/universal/scripts/eu-cookie-policy.js
322.48199987225
442.05199996941
1230
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Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
357.148
9.956
372.556
8.37
733.48
40.022
773.517
60.197
834.528
8.965
850.347
34.408
892.59
21.791
917.397
33.524
958.148
8.56
969.026
8.625
977.995
5.344
991.783
75.056
1066.996
9.374
1079.198
8.514
1092.363
11.777
1104.639
42.091
1147.036
9.898
1157.589
6.068
1169.17
12.351
1183.775
7.001
1191.187
64.47
1261.343
14.134
1276.514
8.07
1285.591
9.418
1295.058
17.634
1314.523
36.013
1352.485
5.81
1358.786
6.681
1372.27
11.033
1383.317
62.91
1446.737
8.232
1455.321
9.042
1466.709
10.225
1477.096
21.306
1501.33
9.882
1511.591
51.811
1568.695
17.285
1589.397
57.501
1648.714
135.723
1784.946
6.696
1794.415
63.007
1857.676
18.31
1877.078
32.855
1911.171
8.115
1922.975
27.195
1950.35
9.327
1963.603
59.216
2023.108
126.992
2150.129
20.037
2170.288
34.107
2204.649
14.598
2219.747
5.311
2225.076
20.967
2247.931
14.29
2262.549
18.625
2281.195
8.983
2309.001
6.835
2315.886
179.59
2521.931
25.345
2548.487
6.285
2555.099
6.73
2570.877
7.728
2578.849
66.969
2646.703
6.039
2653.134
9.255
2662.548
8.007
2683.769
5.133
2695.483
55.059
2750.774
10.581
2762.337
81.795
2844.217
41.32
2898.066
30.446
2928.557
61.422
2990.054
170.072
3161.144
38.706
3215.015
5.096
3220.973
173.118
3406.109
17.424
3424.106
7.712
3431.833
7.832
3439.684
8.682
3451.087
9.086
3460.241
8.779
3470.087
8.456
3478.646
8.905
3487.577
8.571
3496.167
8.071
3504.345
8.811
3522.895
9.227
3538.779
27.203
3566.365
16.325
3583.026
15.655
3599.018
15.986
3615.38
13.715
3629.345
13.554
3646.849
15.361
3662.541
15.331
3678.218
14.706
3693.336
13.145
3711.882
5.5
3724.389
6.226
3734.135
6.269
3750.902
9.361
3767.507
9.449
3850.973
18.423
3869.812
16.692
3952.127
9.395
4670.927
6.786
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Metrics

First Contentful Paint — 3.1 s
The time taken for the first image or text on the page to be rendered.
Largest Contentful Paint — 4.0 s
The timing of the largest text or image that is painted.
Cumulative Layout Shift — 0.203
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

First Meaningful Paint — 3.1 s
The time taken for the primary content of the page to be rendered.
First Contentful Paint (3G) — 5875 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Remove unused CSS — Potential savings of 66 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Highscalability.com should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.youtube.com/s/player/12237e3d/www-player.css
48725
47259
https://static.xx.fbcdn.net/rsrc.php/v3/yg/l/0,cross/bxDq3WVSrtU.css?_nc_x=Ij3Wp8lg5Kz
20328
19899

Diagnostics

Avoid enormous network payloads — Total size was 2,985 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
461574
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147294
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
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https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
121948
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
121948
https://static.xx.fbcdn.net/rsrc.php/v3iHWn4/yR/l/en_US/897dxGauiai.js?_nc_x=Ij3Wp8lg5Kz
82703
Avoid an excessive DOM size — 1,270 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1,270
Maximum DOM Depth
SHOW DETAILS
27
Maximum Child Elements
SHOW DETAILS
18

Metrics

Speed Index — 8.9 s
The time taken for the page contents to be visibly populated.
Time to Interactive — 20.5 s
The time taken for the page to become fully interactive.
Total Blocking Time — 3,490 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

First CPU Idle — 8.7 s
The time taken for the page's main thread to be quiet enough to handle input.
Max Potential First Input Delay — 720 ms
Users could experience a delay when interacting with the page.
Estimated Input Latency — 250 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive highscalability.com as laggy when the latency is higher than 0.05 seconds.

Opportunities

Eliminate render-blocking resources — Potential savings of 2,590 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Highscalability.com should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
8768
630
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
1708
330
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
13746
930
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
3227
480
http://highscalability.com/universal/yui/json/json-min.js?CE=75
2718
330
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
5380
480
http://highscalability.com/universal/yui/selector/selector.js?CE=75
5902
480
http://highscalability.com/universal/yui/element/element.js?CE=75
7038
480
http://highscalability.com/universal/scripts/global.js?CE=75
13726
630
http://highscalability.com/universal/scripts/lightbox.js?CE=75
6409
330
http://highscalability.com/universal/scripts/api.js?CE=75
2379
180
http://highscalability.com/universal/scripts/base64.js?CE=75
1185
180
http://highscalability.com/universal/scripts/census.js?CE=75
797
180
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
4683
330
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
5979
330
http://highscalability.com/universal/scripts/cookie-min.js
1841
180
http://highscalability.com/universal/scripts/eu-cookie-policy.js
1230
180
Defer offscreen images — Potential savings of 243 KiB
Time to Interactive can be slowed down by resources on the page. Highscalability.com should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147033
147033
https://live.staticflickr.com/65535/50338160242_365f87b3fc.jpg
51910
51910
https://live.staticflickr.com/65535/50171516316_8b0e46b191.jpg
49850
49850
Remove unused JavaScript — Potential savings of 863 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
461574
340431
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
121948
100018
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
121986
99839
https://static.xx.fbcdn.net/rsrc.php/v3iHWn4/yR/l/en_US/897dxGauiai.js?_nc_x=Ij3Wp8lg5Kz
82703
75938
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html
111524
59353
https://static.xx.fbcdn.net/rsrc.php/v3/y9/r/09-Z9Xtg2FD.js?_nc_x=Ij3Wp8lg5Kz
49321
48228
https://static.xx.fbcdn.net/rsrc.php/v3iK-b4/y3/l/en_US/3pG6qNfxPzm.js?_nc_x=Ij3Wp8lg5Kz
53589
40659
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
51216
34031
https://static.xx.fbcdn.net/rsrc.php/v3/yN/r/wvDpT6XuE2H.js?_nc_x=Ij3Wp8lg5Kz
55721
29250
https://static.xx.fbcdn.net/rsrc.php/v3/yi/r/-Sdm6B3Y1Mi.js?_nc_x=Ij3Wp8lg5Kz
36516
28078
http://platform.twitter.com/widgets.js
29439
27625
Serve images in next-gen formats — Potential savings of 248 KiB
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
147033
74569
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
36610
30248
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
33369
28265
https://live.staticflickr.com/65535/50366779832_a2b869f0a8.jpg
67033
26709
https://live.staticflickr.com/65535/50171516316_8b0e46b191.jpg
49850
23090
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
20240
16462
https://live.staticflickr.com/65535/50338160242_365f87b3fc.jpg
51910
16152
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
19186
15062
https://live.staticflickr.com/65535/50346304346_e1ab92a728_z.jpg
33663
13061
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
13978
9856

Diagnostics

Serve static assets with an efficient cache policy — 16 resources found
Highscalability.com can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://scalegrid.io/blog/wp-content/uploads/2020/08/mysql-azure-benchmark-scalegrid-vs-azure-database-performance-blog.jpg
0
147294
https://static.doubleclick.net/instream/ad_status.js
900000
644
http://platform.twitter.com/widgets.js
1800000
29439
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
37175
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
33933
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
23446
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
20804
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
19751
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
14696
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
14542
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
11237
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
10026
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
7742
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
86400000
6765
https://www.youtube.com/yts/jsbin/fetch-polyfill-vfl6MZH8P/fetch-polyfill.js
691200000
3694
https://scontent-atl3-2.xx.fbcdn.net/v/t15.5256-10/cp0/e15/q65/s851x315/117752777_332031831478594_4506377047651458343_n.jpg?_nc_cat=102&_nc_sid=ad6a45&_nc_ohc=d3Kmzue3XGkAX_uhbZz&_nc_ht=scontent-atl3-2.xx&oh=59ebeb3d67980824f5b192e5c14917f4&oe=5F94E935
1209600000
9523
Reduce JavaScript execution time — 7.0 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
http://platform.twitter.com/widgets.js
2108.612
1528.532
334.436
http://highscalability.com/
1790.736
21.696
7.916
Unattributable
1257.928
31.136
0.76
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yR/l/en_US/CIxZBBZP0yA.js?_nc_x=Ij3Wp8lg5Kz
632.848
183.86
410.072
https://m.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2Fatscaleevents%2Fvideos%2F332024971479280%2F&show_text=0&width=560
521.392
368.552
71.708
https://static.xx.fbcdn.net/rsrc.php/v3iEpO4/yO/l/en_US/aCsHDMAS5ej.js?_nc_x=Ij3Wp8lg5Kz
501.252
178.36
165.164
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
466.384
307.336
133.688
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F3%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
394.988
139.928
196.892
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F1%2Fmysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
365.224
265.768
43.744
https://static.xx.fbcdn.net/rsrc.php/v3/yN/r/wvDpT6XuE2H.js?_nc_x=Ij3Wp8lg5Kz
360.732
246.984
24.412
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html
359.644
89.208
48.692
https://www.youtube.com/embed/zMua0cuhFnc
340.072
55.736
153.292
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F22%2Fsnakes-in-a-facebook-datacenter.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
292.48
164.828
16.716
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F18%2Fstuff-the-internet-says-on-scalability-for-sep-18th-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
290.184
195.968
36.06
https://static.xx.fbcdn.net/rsrc.php/v3iHWn4/yR/l/en_US/897dxGauiai.js?_nc_x=Ij3Wp8lg5Kz
264.948
205.548
47.692
https://m.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Flike.php%3Fhref%3Dhttp%253A%252F%252Fhighscalability.com%252Fblog%252F2020%252F9%252F21%252Fhow-did-they-send-money-in-the-olden-days-of-telegraphs.html%26layout%3Dstandard%26show_faces%3Dtrue%26width%3D450%26action%3Dlike%26colorscheme%3Dlight%26height%3D80&refsrc=http%3A%2F%2Fhighscalability.com%2F&_rdr
251.94
10.636
16.644
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F7%2F31%2Fstuff-the-internet-says-on-scalability-for-july-31st-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
245.88
107.064
15.832
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F8%2F4%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
235.248
161.808
15.848
https://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F7%2F8%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
175.436
105.728
16.424
https://platform.twitter.com/widgets/widget_iframe.2d7d9a6d04538bf11c7b23641e75738c.html?origin=http%3A%2F%2Fhighscalability.com
115.56
53.988
11.852
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-0&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Snakes%20in%20a%20Facebook%C2%A0Datacenter&time=1601190897155&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F22%2Fsnakes-in-a-facebook-datacenter.html
112.844
39.924
8.5
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
102.204
76.476
3.604
https://www.youtube.com/s/player/12237e3d/www-embed-player.vflset/www-embed-player.js
91.32
50.004
33.54
https://m.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Flike.php%3Fhref%3Dhttp%253A%252F%252Fhighscalability.com%252Fblog%252F2020%252F9%252F14%252Fmoving-hpc-to-the-cloud-a-guide-for-2020.html%26layout%3Dstandard%26show_faces%3Dtrue%26width%3D450%26action%3Dlike%26colorscheme%3Dlight%26height%3D80&refsrc=http%3A%2F%2Fhighscalability.com%2F&_rdr
83.044
10.896
4.804
https://static.xx.fbcdn.net/rsrc.php/v3ikP64/yB/l/en_US/sQJScwTAeRA.js?_nc_x=Ij3Wp8lg5Kz
76.448
58.756
10.036
https://static.xx.fbcdn.net/rsrc.php/v3iK-b4/y3/l/en_US/3pG6qNfxPzm.js?_nc_x=Ij3Wp8lg5Kz
73.216
6.96
35.76
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-1&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=How%20did%20they%20send%20money%20in%20the%20olden%20days%20of%C2%A0telegraphs%3F&time=1601190897158&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F21%2Fhow-did-they-send-money-in-the-olden-days-of-telegraphs.html
67.436
37.812
10.144
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-3&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Sponsored%20Post%3A%20IP2Location%2C%20Ipdata%2C%20StackHawk%2C%20InterviewCamp.io%2C%20Educative%2C%20Triplebyte%2C%20Stream%2C%C2%A0Fauna&time=1601190897160&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F18%2Fsponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html
66.252
38.876
10.232
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-2&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Stuff%20The%20Internet%20Says%20On%20Scalability%20For%20Sep%2018th%2C%C2%A02020&time=1601190897159&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F18%2Fstuff-the-internet-says-on-scalability-for-sep-18th-2020.html
64.992
38.308
9.548
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-6&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=MySQL%20on%20Azure%20Performance%20Benchmark%20%E2%80%93%20ScaleGrid%20vs.%20Azure%C2%A0Database&time=1601190897163&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F1%2Fmysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html
64.724
37.26
10.708
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-5&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Sponsored%20Post%3A%20Ipdata%2C%20StackHawk%2C%20InterviewCamp.io%2C%20Educative%2C%20Triplebyte%2C%20Stream%2C%C2%A0Fauna&time=1601190897162&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F3%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html
63.872
37.684
9.508
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-9&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Sponsored%20Post%3A%20ipdata%2C%20StackHawk%2C%20InterviewCamp.io%2C%20Educative%2C%20Triplebyte%2C%20Stream%2C%C2%A0Fauna&time=1601190897167&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F7%2F8%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html
61.308
36.248
9.524
https://www.youtube.com/s/player/12237e3d/www-player.css
58.392
0
0
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-4&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Moving%20HPC%20to%20the%20Cloud%3A%20A%20Guide%20for%202020%C2%A0&time=1601190897161&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F9%2F14%2Fmoving-hpc-to-the-cloud-a-guide-for-2020.html
57.312
34.08
9.052
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-7&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Sponsored%20Post%3A%20ipdata%2C%20StackHawk%2C%20InterviewCamp.io%2C%20Educative%2C%20Triplebyte%2C%20Stream%2C%C2%A0Fauna&time=1601190897165&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F8%2F4%2Fsponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html
56.452
34.02
8.34
https://platform.twitter.com/widgets/tweet_button.2d7d9a6d04538bf11c7b23641e75738c.en.html#dnt=false&id=twitter-widget-8&lang=en&original_referer=http%3A%2F%2Fhighscalability.com%2F&size=m&text=Stuff%20The%20Internet%20Says%20On%20Scalability%20For%20July%2031st%2C%C2%A02020&time=1601190897166&type=share&url=http%3A%2F%2Fhighscalability.com%2Fblog%2F2020%2F7%2F31%2Fstuff-the-internet-says-on-scalability-for-july-31st-2020.html
55.336
31.144
9.676
https://static.xx.fbcdn.net/rsrc.php/v3/yi/r/-Sdm6B3Y1Mi.js?_nc_x=Ij3Wp8lg5Kz
54.224
7.62
23.164
Minimize main-thread work — 12.5 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
5101.5840000001
Other
2293.908
Script Parsing & Compilation
2077.44
Style & Layout
1410.284
Parse HTML & CSS
784.324
Rendering
499.92
Garbage Collection
329.196
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc9AMP6lQ.ttf
9.2450000811368
https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxPKTU1Kg.ttf
8.4150000475347
Reduce the impact of third-party code — Third-party code blocked the main thread for 2,880 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
1570617
1584.424
SHOW DETAILS
169067
911.384
SHOW DETAILS
588369
382.204
SHOW DETAILS
215647
0
SHOW DETAILS
30051
0
SHOW DETAILS
5926
0
SHOW DETAILS
4113
0
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
URL Location
https://www.youtube.com/s/player/12237e3d/player_ias.vflset/en_US/base.js
line: 3545
53

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of highscalability.com. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Highscalability.com may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Highscalability.com may provide relevant information that dialogue cannot, by using audio descriptions.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
TUESDAY, SEPTEMBER 22, 2020 AT 10:10AM
Todd Hoff | 1 Comment | Permalink | Share Article Print Article Email Article
in facebook
MONDAY, SEPTEMBER 21, 2020 AT 9:03AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
FRIDAY, SEPTEMBER 18, 2020 AT 9:05AM
Todd Hoff | 1 Comment | Permalink | Share Article Print Article Email Article
in hot links
FRIDAY, SEPTEMBER 18, 2020 AT 9:01AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in sponsored post
MONDAY, SEPTEMBER 14, 2020 AT 9:15AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
THURSDAY, SEPTEMBER 3, 2020 AT 8:29AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links
TUESDAY, SEPTEMBER 1, 2020 AT 8:02AM
Kristi Anderson | Post a Comment | Permalink | Share Article Print Article Emai…
tagged Azure Database, Database Infrastructure, Database as a Service, MySQL Az…
in Azure, Database, MySQL, benchmark, databases
TUESDAY, AUGUST 4, 2020 AT 9:30AM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links
FRIDAY, JULY 31, 2020 AT 9:25AM
Todd Hoff | 3 Comments | Permalink | Share Article Print Article Email Article
in hot links
WEDNESDAY, JULY 8, 2020 AT 3:22PM
Todd Hoff | Post a Comment | Permalink | Share Article Print Article Email Arti…
in hot links

Names and labels

`<frame>` or `<iframe>` elements do not have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Failing Elements
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
iframe
Image elements do not have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Failing Elements
img
img
img
img
img
img
img
img
Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Failing Elements
input
Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Tables and lists

Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
Failing Elements
InterviewCamp.io has hours of system design content. They also do live system d…
IP2Location is IP address geolocation service provider since 2002. The geolocat…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…
InterviewCamp.io has hours of system design content. They also do live system d…
ipdata is a reliable IP Address Geolocation API that allows you to lookup the a…

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
57

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that highscalability.com should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids front-end JavaScript libraries with known security vulnerabilities
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
YUI 2
2.8.0r4
WebFont Loader
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.

Audits

Does not use HTTPS — 68 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://highscalability.com/
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
http://highscalability.com/universal/yui/json/json-min.js?CE=75
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
http://highscalability.com/universal/yui/selector/selector.js?CE=75
http://highscalability.com/universal/yui/element/element.js?CE=75
http://highscalability.com/universal/scripts/global.js?CE=75
http://highscalability.com/universal/scripts/lightbox.js?CE=75
http://highscalability.com/universal/scripts/api.js?CE=75
http://highscalability.com/universal/scripts/base64.js?CE=75
http://highscalability.com/universal/scripts/census.js?CE=75
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
http://highscalability.com/universal/scripts/cookie-min.js
http://highscalability.com/universal/scripts/eu-cookie-policy.js
http://highscalability.com/storage/HSBannerTrebuchet.jpg
http://highscalability.com/storage/ip2location-highscalability.png
http://highscalability.com/storage/Add%20AppSec%20Testing%20to%20Your%20CI%20Pipeline%20-%20B%20-%20125x125.jpg
http://highscalability.com/storage/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png
http://highscalability.com/storage/highscalability-ad-125x125-white%202.png
http://highscalability.com/storage/interviewcamp125.png
http://highscalability.com/storage/highscalability%20ad.png
http://highscalability.com/storage/125x125-javascript.png
http://highscalability.com/storage/scalability-track-highscalability.png
http://highscalability.com/storage/stream.png
http://highscalability.com/storage/triplebyte125.png
http://highscalability.com/universal/images/transparent.png
http://platform.twitter.com/widgets.js
http://farm3.static.flickr.com/2363/5781449767_54902da8a5_o.jpg
http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/22/snakes-in-a-facebook-datacenter.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/universal/images/core-resources/icons/smalllight/open-off-site.png
http://highscalability.com/universal/images/xml/feed-icon-12x12-orange.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/date.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/user-registered.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/comment.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/permalink.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/share.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/print.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/email.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/category.png
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/21/how-did-they-send-money-in-the-olden-days-of-telegraphs.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/stuff-the-internet-says-on-scalability-for-sep-18th-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/sponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/14/moving-hpc-to-the-cloud-a-guide-for-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/3/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/1/mysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/8/4/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/31/stuff-the-internet-says-on-scalability-for-july-31st-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/8/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/process/RecordHit?url=%2F&title=High%20Scalability%20-&viewportInnerHeight=1742&viewportInnerWidth=980&screenHeight=640&screenWidth=360&userAgent=Mozilla%2F5.0%20(Linux%3B%20Android%207.0%3B%20Moto%20G%20(4))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F84.0.4143.7%20Mobile%20Safari%2F537.36%20Chrome-Lighthouse&referrer=&pixelRatio=2.625&event=View
http://highscalability.com/universal/images/overlay-arrow-left.png
http://highscalability.com/universal/images/overlay-arrow-right.png
http://highscalability.com/universal/images/manager/loading.gif
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.

Audits

Serves images with low resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
URL Displayed size Actual size Expected size
https://live.staticflickr.com/65535/50366779832_a2b869f0a8.jpg
500 x 327
500 x 327
1313 x 859
http://highscalability.com/storage/HSBannerTrebuchet.jpg
824 x 120
824 x 120
2163 x 315
http://highscalability.com/storage/highscalability-ad-125x125-white%202.png
125 x 125
125 x 100
329 x 329
http://highscalability.com/storage/125x125-javascript.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/Add%20AppSec%20Testing%20to%20Your%20CI%20Pipeline%20-%20B%20-%20125x125.jpg
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/highscalability%20ad.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/interviewcamp125.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/ip2location-highscalability.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/scalability-track-highscalability.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/stream.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/storage/triplebyte125.png
125 x 125
125 x 125
329 x 329
http://highscalability.com/universal/images/transparent.png
13 x 13
1 x 1
35 x 35

Audits

Page lacks the HTML doctype, thus triggering quirks-mode
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.

Audits

Registers an `unload` listener
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
URL
SHOW DETAILS
Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
URL Description
https://www.youtube.com/api/stats/qoe?event=streamingstats&cpn=LTFqTqIBP7VXM-iM&ei=7jtwX8uFL6qQkATM9JvgBg&el=embedded&docid=zMua0cuhFnc&ns=yt&fexp=23744176%2C23804281%2C23839597%2C23854340%2C23856950%2C23857950%2C23862346%2C23882685%2C23884386%2C23885487%2C23885572%2C23895671%2C23896574%2C23911055%2C23915654%2C23915991%2C23916148%2C23916390%2C23918597%2C23921357%2C23928508%2C23930220%2C23934970%2C23935842%2C23938800%2C23940079%2C23940248%2C23940703%2C23942338%2C23944125%2C23944779%2C23945378%2C23945479%2C23946420%2C23947185%2C23947421%2C23947698%2C23948419%2C23948841%2C23949503%2C23951192%2C24590262%2C24631194%2C9449243&cl=333382973&seq=1&c=WEB_EMBEDDED_PLAYER&cver=20200925&cplayer=UNIPLAYER&cbr=Chrome%20Mobile&cbrver=84.0.4143.7&cos=Android&cosver=7.0&vps=0.000:N,0.000:ER&cmt=0.000:0.000,0.000:0.000&error=0.000:html5.missingapi:0.000:nocodecs.1;a6s.0&vis=0.000:0&bh=0.000:0.000
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT.Inspector
http://highscalability.com/
Refused to display 'https://m.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Flike.php%3Fhref%3Dhttp%253A%252F%252Fhighscalability.com%252Fblog%252F2020%252F9%252F14%252Fmoving-hpc-to-the-cloud-a-guide-for-2020.html%26layout%3Dstandard%26show_faces%3Dtrue%26width%3D450%26action%3Dlike%26colorscheme%3Dlight%26height%3D80&refsrc=http%3A%2F%2Fhighscalability.com%2F&_rdr' in a frame because it set 'X-Frame-Options' to 'deny'.
http://highscalability.com/
Refused to display 'https://m.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Flike.php%3Fhref%3Dhttp%253A%252F%252Fhighscalability.com%252Fblog%252F2020%252F9%252F18%252Fsponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html%26layout%3Dstandard%26show_faces%3Dtrue%26width%3D450%26action%3Dlike%26colorscheme%3Dlight%26height%3D80&refsrc=http%3A%2F%2Fhighscalability.com%2F&_rdr' in a frame because it set 'X-Frame-Options' to 'deny'.
http://highscalability.com/
Refused to display 'https://m.facebook.com/login/?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Flike.php%3Fhref%3Dhttp%253A%252F%252Fhighscalability.com%252Fblog%252F2020%252F9%252F21%252Fhow-did-they-send-money-in-the-olden-days-of-telegraphs.html%26layout%3Dstandard%26show_faces%3Dtrue%26width%3D450%26action%3Dlike%26colorscheme%3Dlight%26height%3D80&refsrc=http%3A%2F%2Fhighscalability.com%2F&_rdr' in a frame because it set 'X-Frame-Options' to 'deny'.
54

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for highscalability.com. This includes optimizations such as providing meta data.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Mobile Friendly

Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of highscalability.com on mobile screens.
Document doesn't use legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are not sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.
Image elements do not have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Failing Elements
img
img
img
img
img
img
img
img

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
4

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of highscalability.com. This includes details about web app manifests.

PWA Optimized

Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Fast and reliable

Page load is not fast enough on mobile networks — Interactive at 20.5 s
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.
Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 68 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://highscalability.com/
http://highscalability.com/display/common.css?styleId=512250&RK=1552578797277&CE=75
http://highscalability.com/universal/styles/squarespace-gallery-slideshow.css?CE=75
http://highscalability.com/universal/yui/yahoo-dom-event/yahoo-dom-event.js?CE=75
http://highscalability.com/universal/yui/connection/connection_core-min.js?CE=75
http://highscalability.com/universal/yui/json/json-min.js?CE=75
http://highscalability.com/universal/yui/animation/animation-min.js?CE=75
http://highscalability.com/universal/yui/selector/selector.js?CE=75
http://highscalability.com/universal/yui/element/element.js?CE=75
http://highscalability.com/universal/scripts/global.js?CE=75
http://highscalability.com/universal/scripts/lightbox.js?CE=75
http://highscalability.com/universal/scripts/api.js?CE=75
http://highscalability.com/universal/scripts/base64.js?CE=75
http://highscalability.com/universal/scripts/census.js?CE=75
http://highscalability.com/universal/scripts/yui2-yui3-bridge.js?CE=75
http://highscalability.com/universal/scripts/squarespace-gallery-slideshow.js?CE=75
http://highscalability.com/universal/scripts/cookie-min.js
http://highscalability.com/universal/scripts/eu-cookie-policy.js
http://highscalability.com/storage/HSBannerTrebuchet.jpg
http://highscalability.com/storage/ip2location-highscalability.png
http://highscalability.com/storage/Add%20AppSec%20Testing%20to%20Your%20CI%20Pipeline%20-%20B%20-%20125x125.jpg
http://highscalability.com/storage/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png
http://highscalability.com/storage/highscalability-ad-125x125-white%202.png
http://highscalability.com/storage/interviewcamp125.png
http://highscalability.com/storage/highscalability%20ad.png
http://highscalability.com/storage/125x125-javascript.png
http://highscalability.com/storage/scalability-track-highscalability.png
http://highscalability.com/storage/stream.png
http://highscalability.com/storage/triplebyte125.png
http://highscalability.com/universal/images/transparent.png
http://platform.twitter.com/widgets.js
http://farm3.static.flickr.com/2363/5781449767_54902da8a5_o.jpg
http://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/22/snakes-in-a-facebook-datacenter.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/universal/images/core-resources/icons/smalllight/open-off-site.png
http://highscalability.com/universal/images/xml/feed-icon-12x12-orange.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/date.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/user-registered.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/comment.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/permalink.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/share.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/print.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/email.png
http://highscalability.com/universal/images/core-resources/icons/smalllight/category.png
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/21/how-did-they-send-money-in-the-olden-days-of-telegraphs.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28348722/1600403609007/ip2location-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28311115/1591821418837/Add+AppSec+Testing+to+Your+CI+Pipeline+-+B+-+125x125.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28303827/1590435242263/highscalability-ad-125x125-white+2.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28311691/1591905984347/125x125-LogDNA-Ad-HighScalability-Sponsorship-02.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/stuff-the-internet-says-on-scalability-for-sep-18th-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/28093251/1552153869240/triplebyte125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28278187/1585580743313/interviewcamp125.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28298939/1589493547283/highscalability+ad.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28281963/1586311074727/scalability-track-highscalability.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/18/sponsored-post-ip2location-ipdata-stackhawk-interviewcampio.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://static1.1.sqspcdn.com/static/f/426227/4315923/1254429857540/HSBannerTrebuchet.jpg?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28202943/1571102403213/125x125-javascript.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://static1.1.sqspcdn.com/static/f/426227/28111838/1555007638630/stream.png?token=gSHhzY%2FKm%2FXBiiowJdgnvwPOeDA%3D
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/14/moving-hpc-to-the-cloud-a-guide-for-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/3/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/9/1/mysql-on-azure-performance-benchmark-scalegrid-vs-azure-data.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/8/4/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/31/stuff-the-internet-says-on-scalability-for-july-31st-2020.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://www.facebook.com/plugins/like.php?href=http://highscalability.com/blog/2020/7/8/sponsored-post-ipdata-stackhawk-interviewcampio-educative-tr.html&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&height=80
http://highscalability.com/process/RecordHit?url=%2F&title=High%20Scalability%20-&viewportInnerHeight=1742&viewportInnerWidth=980&screenHeight=640&screenWidth=360&userAgent=Mozilla%2F5.0%20(Linux%3B%20Android%207.0%3B%20Moto%20G%20(4))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F84.0.4143.7%20Mobile%20Safari%2F537.36%20Chrome-Lighthouse&referrer=&pixelRatio=2.625&event=View
http://highscalability.com/universal/images/overlay-arrow-left.png
http://highscalability.com/universal/images/overlay-arrow-right.png
http://highscalability.com/universal/images/manager/loading.gif
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Does not redirect HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is not sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of highscalability.com on mobile screens.
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 172.67.173.147
Continent: North America
Country: United States
United States Flag
Region:
City:
Longitude: -97.822
Latitude: 37.751
Currencies: USD
USN
USS
Languages: English

Web Hosting Provider

Name IP Address
Cloudflare, Inc.
Registration

Domain Registrant

Private Registration: No
Name:
Organization:
Country:
City:
State:
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Name IP Address
Wild West Domains, LLC 23.205.107.72
Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating: 4.5/5 (2 reviews)
WOT Trustworthiness: 90/100
WOT Child Safety: 92/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: sni.cloudflaressl.com
Issued By: Cloudflare Inc ECC CA-3
Valid From: 6th August, 2020
Valid To: 6th August, 2021
Subject: CN = sni.cloudflaressl.com
O = Cloudflare, Inc.
L = San Francisco
S = US
Hash: 4d04c09a
Issuer: CN = Cloudflare Inc ECC CA-3
O = Cloudflare, Inc.
S = US
Version: 2
Serial Number: 21229430683845957942982236572617407963
Serial Number (Hex): 0FF8A3BE815FBD9E2EE32B4D7F59FDDB
Valid From: 6th August, 2024
Valid To: 6th August, 2024
Signature Algorithm (Short Name): ecdsa-with-SHA256
Signature Algorithm (Long Name): ecdsa-with-SHA256
Authority Key Identifier: keyid:A5:CE:37:EA:EB:B0:75:0E:94:67:88:B4:45:FA:D9:24:10:87:96:1F
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl3.digicert.com/CloudflareIncECCCA-3.crl

Full Name:
URI:http://crl4.digicert.com/CloudflareIncECCCA-3.crl
Certificate Policies: Policy: 2.16.840.1.114412.1.1
CPS: https://www.digicert.com/CPS
Policy: 2.23.140.1.2.2
Authority Information Access: OCSP - URI:http://ocsp.digicert.com
CA Issuers - URI:http://cacerts.digicert.com/CloudflareIncECCCA-3.crt
SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : F6:5C:94:2F:D1:77:30:22:14:54:18:08:30:94:56:8E:
E3:4D:13:19:33:BF:DF:0C:2F:20:0B:CC:4E:F1:64:E3
Timestamp : Aug 6 19:36:28.836 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:41:F9:E6:38:0E:0C:AC:2F:1E:AF:30:CA:
87:D7:FD:0C:8F:45:79:45:8E:A0:1A:93:B6:35:FF:31:
69:BF:4E:EC:02:21:00:F9:C5:8F:17:38:31:63:32:AE:
EB:BC:1C:D3:97:FD:D3:03:45:01:9C:A1:EE:18:50:DD:
26:F7:DF:BB:71:28:D1
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 5C:DC:43:92:FE:E6:AB:45:44:B1:5E:9A:D4:56:E6:10:
37:FB:D5:FA:47:DC:A1:73:94:B2:5E:E6:F6:C7:0E:CA
Timestamp : Aug 6 19:36:28.884 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:44:02:20:26:75:A7:99:E9:0E:81:3C:96:BD:A3:8C:
DF:B1:B9:B8:52:83:24:54:08:58:FB:DB:32:AB:D7:A5:
83:B4:5F:54:02:20:24:EF:B1:5C:AC:A3:87:57:A5:F6:
3A:DA:E5:91:A3:8D:A7:04:0B:89:16:07:3C:AD:7D:3C:
20:64:D7:D2:1A:B1
Key Usage: Digital Signature
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:*.highscalability.com
DNS:sni.cloudflaressl.com
DNS:highscalability.com
Technical

DNS Lookup

HTTP Response Headers

HTTP-Code: HTTP/1.1 200 OK
Date: 27th September, 2020
Content-Type: text/html;charset=UTF-8
Server: cloudflare
Connection: keep-alive
Set-Cookie: *
x-contextid: x5zJrcIm/ODs2W6FR
CF-Cache-Status: DYNAMIC
cf-request-id: 057002911c0000158b950f1200000001
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?lkg-colo=11&lkg-time=1601190853"}],"group":"cf-nel","max_age":604800}
NEL: {"report_to":"cf-nel","max_age":604800}
CF-RAY: 5d936d2e9808158b-EWR

Whois Lookup

Created: 29th April, 2007
Changed: 19th April, 2015
Expires: 29th April, 2023
Registrar: Wild West Domains, LLC
Status: clientTransferProhibited
clientUpdateProhibited
clientRenewProhibited
clientDeleteProhibited
Nameservers: kay.ns.cloudflare.com
vern.ns.cloudflare.com
Owner State: California
Owner Country: US
Owner Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Admin Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Tech Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Full Whois: Domain Name: HIGHSCALABILITY.COM
Registry Domain ID: 949491592_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.wildwestdomains.com
Registrar URL: http://www.wildwestdomains.com
Updated Date: 2015-04-19T15:41:37Z
Creation Date: 2007-04-29T15:33:33Z
Registrar Registration Expiration Date: 2023-04-29T15:33:33Z
Registrar: Wild West Domains, LLC
Registrar IANA ID: 440
Registrar Abuse Contact Email: abuse@wildwestdomains.com
Registrar Abuse Contact Phone: +1.4806242505
Reseller: Cheapnames
Domain Status: clientTransferProhibited http://www.icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited http://www.icann.org/epp#clientUpdateProhibited
Domain Status: clientRenewProhibited http://www.icann.org/epp#clientRenewProhibited
Domain Status: clientDeleteProhibited http://www.icann.org/epp#clientDeleteProhibited
Registrant Organization:
Registrant State/Province: California
Registrant Country: US
Registrant Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Admin Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Tech Email: Select Contact Domain Holder link at https://www.secureserver.net/whois?plid=1387&domain=HIGHSCALABILITY.COM
Name Server: KAY.NS.CLOUDFLARE.COM
Name Server: VERN.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2020-09-27T07:00:00Z <<<

For more information on Whois status codes, please visit https://www.icann.org/resources/pages/epp-status-codes-2014-06-16-en

TERMS OF USE: The data contained in this registrar's Whois database, while believed by the
registrar to be reliable, is provided "as is" with no guarantee or warranties regarding its
accuracy. This information is provided for the sole purpose of assisting you in obtaining
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Nameservers

Name IP Address
kay.ns.cloudflare.com 108.162.192.125
vern.ns.cloudflare.com 172.64.33.243
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