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I've noticed that chrome is very fast at start up, but if I forgot it opened for some time, when I get back to it again switching tabs and repaint is very slow. Repaint take like 0.5 seconds. Could it be related to the handling on the many processes on Windows ?

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I've noticed the same thing, and that I seem to have less of a problem with that on other platforms.

In chrome each tab is its own process. If you don't have much ram then leaving a tab idle for a long time will cause its resources to be swapped out to disk so reactivating it might be slow. Same as any other application you leave idle on a machine with low ram.

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