> On public CDNs- I mean public CDNs for common libraries (jQuery, Angular, Font Awesome) can improve page load time if a user already has the file. The more si

> On public CDNs- I mean public CDNs for common libraries (jQuery, Angular, Font Awesome) can improve page load time if a user already has the file. The more sites use the same public CDN, the more users benefit. But if a user doesn't have the file already, it's a loss. So, tradeoffs. Even this has a tradeoff - if, for example, the other JS on your page require JQuery, you can't make the CDN copy of JQuery use an "async" tag, because you can't be certain of the order the JS will execute. And if you're not using the async tag, the first load will suffer.