Hello, I am still running SMF 2.13. The options in admin are listed Google CDN, jQuery CDN, Microsoft CDN, local, and custom URL for the jQuery library.
Would it be better to use it stored on my own server if I have a really fast server? I know my host would install if they can, if it isn't already installed.
Screenshot of admin panel setting: https://prnt.sc/xDQDiA-fu19K
Doesn't really matter, for performance
Using a hosted cdn means that you get automatic updates.
This was asked recently. Fuller explanation here...
https://www.simplemachines.org/community/index.php?topic=586130.msg4154086#msg4154086
Sorry, forgot.