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I don't have a lot of experience with js but isn't the idea that you link to their file urls and if everyone does this than users are only downloading once and

I don't have a lot of experience with js but isn't the idea that you link to their file urls and if everyone does this than users are only downloading once and caching (typically anyway)? Or are you more worried about page load time, not download time? typically unless you're like me and clear cache when the browser closes...

hyperpape 10y ago
Common misconception. Even on large web properties like Facebook, a large number of users have empty caches. For your site, with less traffic than Facebook, it'll probably be worse. Linking to shared libraries hosted on a CDN often ends up failing because of distinct versions.