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The hard numbers don't tell the whole story, though.

For example, something like Kayak.com takes a very long time (~10-15 seconds) to load a results list. However, the whole experience feels very fast because the data layer is separated from the presentation layer, and the presentation layer comes up very quickly, with data allowed to load incrementally "below the fold".

Put another way, part of "page speed" is also how fast the user can start interacting with any of it, even if it's just to start looking at the initial search results.

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