Not the initial loading shiv, mind you, which is different for every site, but the subsequent lazy-loaded code will be much the same and have the same URLs. Same thing happens with Facebook's JS, it loads a short JS file which then loads like 10 others, all of which are basically the same from site to site.
This is why single-page-testing tools and things like YSlow and such don't tell the whole story. They're only measuring the performance of one particular page load, you really have to see it from a whole-site standpoint.
That is one great answer and that makes perfect sense. It would be interesting to see some analytics on how many people really do have it pre-cached before they get to our site. As an aside do you know of any way to detect if a cached version is being used (Client side JS library maybe)?
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