While Google and Microsoft are not included, JSDelivr (StackPath+fastly+CloudFlare+Quantil) compares themselves to MaxCDN (now StackPath which is the official jQuery CDN) and CloudFlare (the cdnjs provider) here: https://www.cdnperf.com/cdn-compare?type=performance&locatio...
KeyCDN has an online asset performance tool that we can use to compare the hosted jquery.min.js files. The numbers included here are results received (to the San Francisco location) in ms of [DNS lookup time] / [time to connect to server] / [overhead of TLS connection on individual asset] / [time from client HTTP request to receiving first byte from server]:
When I tested them, only jsDelivr and cdnjs/Cloudflare recieved green results (under 200ms time to connect and under 400ms time to first byte) from all 16 worldwide test locations. Averaging the results between these two across 16 locations, I would go with jsDelivr who had a faster average TTFB. The fact that they are combining CloudFlare, Fastly, StackPath, and Quantil (who I had never heard of until today) might explain their global results.
KeyCDN has an online asset performance tool that we can use to compare the hosted jquery.min.js files. The numbers included here are results received (to the San Francisco location) in ms of [DNS lookup time] / [time to connect to server] / [overhead of TLS connection on individual asset] / [time from client HTTP request to receiving first byte from server]:
Original, jQuery CDN:
https://tools.keycdn.com/performance?url=https://code.jquery...
8 / 2 / 79 / 85
Google:
https://tools.keycdn.com/performance?url=https://ajax.google...
32 / 2 / 132 / 155
Microsoft:
https://tools.keycdn.com/performance?url=https://ajax.micros...
128 / 3 / 122 / 130
Microsoft ASP.NET:
https://tools.keycdn.com/performance?url=https://ajax.aspnet...
128 / 3 / 114 / 120
jsDelivr:
https://tools.keycdn.com/performance?url=https://cdn.jsdeliv...
64 / 3 / 118 / 129
cdnjs:
https://tools.keycdn.com/performance?url=https://cdnjs.cloud...
64 / 2 / 118 / 125
Yandex.ru:
https://tools.keycdn.com/performance?url=https://yastatic.ne...
32 / 139 / 667 / 993
When I tested them, only jsDelivr and cdnjs/Cloudflare recieved green results (under 200ms time to connect and under 400ms time to first byte) from all 16 worldwide test locations. Averaging the results between these two across 16 locations, I would go with jsDelivr who had a faster average TTFB. The fact that they are combining CloudFlare, Fastly, StackPath, and Quantil (who I had never heard of until today) might explain their global results.