[dathinab]

> So the natural progression here is that only big sites with their own CDN solution will be fast?

No.

This is about disabling cross domain caching. Which rarely has a cache hit already by now (see many other posts on this site).

> "rely on a large service to actual host your content for you"

This is the case anyway even with cross domain caching as the source you cache still needs to have the exact same URL including domain. The cross domain only refers to the site loading the resource.

So e.g. `foo.example/jquery-3.2.1` and `bar.example/jquery-3.2.1` where never treated as the same at any point in time. The only think changed is that if `foo.example` and `bar.example` both depended on `cdn.example/jquery-3.2.1` and you visited `foo.example` before `bar.example` it might already have been cached when you visit `bar.example`. Through most times it wasn't as e.g. `bar` used a different CDN a different URL to the same resource or a different version.

So this change doesn't really affect small sites more then any other side. And the effect is generally negligible.