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I guess it really depends on the use case and the library. I can imagine a tonne of WP sites referencing jQuery from the Google CDN, e.g.: https://ajax.googlea

I guess it really depends on the use case and the library. I can imagine a tonne of WP sites referencing jQuery from the Google CDN, e.g.: https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.mi... Looking at the headers the JS asset would be cached for 1 year.

dathinab 6y ago
There are always a few exceptions. But you also must consider that most people most times visit a small set of domains. Which means that most times they will have jquery and similar cached even without cross domain caching.