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WebPagetest Forums - Performance standards?

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Dear all, I am looking for performace standards. Are there any studies which say "a website has to load under XY seconds or a user kills the action before he has entered the site". Are there any associations with serious reputation which ran such a study or which stated a standard. The same question should be answered for mobile sites.
There are a ton of them out there, the best of which are correlation studies and A/B experiments showing the falloff in conversion as performance degrades. It is a continuum though so you won't find a hard number where there is a cutoff, though you may find diminishing returns after a point.

Joshua Bixby's "Web Performance Today" blog is a pretty good aggregation point for a lot of the studies:
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