Does it actually matter which CDN you use to link to your jquery file or any javascript file for that matter. Is one potentially faster than the other? What other factors could play a role in which cdn you decide to use? I know that Microsoft, Yahoo, and Google all have CDN's now.
17 Answers
Google will send you a jQuery version minified with their own software, this version is 6kb lighter than the standard minified version served by MS. Go for Google.
One minor thing to consider is that both companies offer slightly different "extra" libraries:
- Microsoft is offering the JQuery validation library on their CDN, whereas Google is not (http://www.asp.net/ajaxlibrary/cdn.ashx)
- Google is offering the JQuery UI library on their CDN, whereas Microsoft is not (http://code.google.com/apis/ajaxlibs/documentation/)
Depending on your needs, this may be relevant.
One additional consideration - if your site is SSL and you need to support Android 2.1 (or earlier), the SSL certificate on the HTTPS version of the Microsoft CDN will crash those versions of the Android browser, per this issue: http://code.google.com/p/android/issues/detail?id=5001. It's not Microsoft's "fault", as the SSL certificate is technically valid and the defect is in Android's SSL implementation... but it will crash your site, nonetheless.
The SSL cert on Google's CDN does not fall afoul of this particular issue (relating to the certificate's "Certificate Subject Alt Name").
So, for SSL + Android 2.1 support, use the Google CDN.
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