CDNs

I found 3,576 files hosted by various major CDNs.
That means there are on average 3.41 CDNs for each released library version.

Availability

Not all CDNs host all current and prior versions. This table shows the availability:
Project Releases Baidu Boot cdnjs fastcdn Google jsdelivr MaxCDN Microsoft Sina unpkg Yandex
AngularJS 144 50.7% 100.0% 100.0% - 79.2% 31.9% - - 7.6% 51.4% 32.6%
BackboneJS 25 40.0% 96.0% 96.0% 4.0% - 60.0% - - 8.0% 96.0% 20.0%
Bootstrap 28 17.9% 71.4% 96.4% 3.6% - 100.0% 100.0% 78.6% 21.4% 78.6% 39.3%
D3 142 35.2% 99.3% 99.3% 0.7% - 33.1% - - - 74.6% 0.7%
Dojo 113 17.7% 46.9% 47.8% 0.9% - 4.4% - - 13.3% - 12.4%
Ember 108 12.0% 99.1% 99.1% 0.9% - 27.8% - - - - -
jQuery 79 48.1% 65.8% 77.2% 2.5% 77.2% 49.4% - 68.4% 11.4% 38.0% 60.8%
Knockout 19 - 73.7% 73.7% - - 42.1% - 36.8% - 57.9% -
lodash 47 - 100.0% 100.0% - - 76.6% - - - 83.0% 17.0%
React 70 1.4% 94.3% 95.7% - - 97.1% - - - 52.9% -
Socket.IO 39 - 100.0% 100.0% - - - - - - - -
ThreeJS 68 - 50.0% 89.7% 1.5% 27.9% 67.6% - - - 79.4% -
UnderscoreJS 63 84.1% 95.2% 95.2% 1.6% - 14.3% - - 1.6% 54.0% 9.5%
Vue 103 - 100.0% 100.0% - - 49.5% - - - 100.0% -


CDN Overhead

Average compression overhead compared to my best files:
Project Releases Baidu Boot cdnjs fastcdn Google jsdelivr MaxCDN Microsoft Sina unpkg Yandex
AngularJS 144 104.6% 117.4% 104.4% - 103.9% 104.7% - - 103.4% 105.0% 103.4%
BackboneJS 25 103.6% 116.9% 103.3% 103.2% - 105.8% - - 102.8% 104.2% 102.8%
Bootstrap 28 105.0% 123.0% 104.9% 103.9% - 104.8% 114.9% 131.5% 104.1% 111.8% 103.9%
D3 142 105.3% 117.1% 106.0% 104.7% - 111.3% - - - 109.7% 104.3%
Dojo 113 105.7% 121.7% 105.8% 106.7% - 105.4% - - 105.2% - 106.0%
Ember 108 106.0% 127.7% 105.7% 103.7% - 112.3% - - - - -
jQuery 79 104.6% 119.7% 104.6% 103.8% 103.9% 114.1% - 129.3% 103.7% 106.3% 100.3%
Knockout 19 - 117.4% 104.2% - - 103.3% - 129.1% - 107.7% -
lodash 47 - 135.4% 119.1% - - 104.1% - - - 106.3% 104.1%
React 70 105.8% 113.7% 103.8% - - 104.4% - - - 104.3% -
Socket.IO 39 - 116.0% 105.4% - - - - - - - -
ThreeJS 68 - 126.4% 105.4% 104.5% 104.5% 104.2% - - - 112.2% -
UnderscoreJS 63 103.2% 114.0% 102.9% 103.2% - 115.6% - - 102.5% 104.4% 102.9%
Vue 103 - 117.6% 104.6% - - 103.8% - - - 106.5% -
Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

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