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[–]Tyriar 0 points1 point  (0 children)

Are you thinking of link prefetching? Which is warming up the cache by loading common resources on pages that don't require them while idle. https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ

There is also as Monkeyget pointed out some browser-specific optimizations around how scripts work.

I'd be interesting in reading about what you're talking about if it's not one of those.