I doesn't happen consistently after every suspend/resume. The first sign
of problems is slow redraw when the screen is first unlocked after a
resume.

[There is a known issue with the nvidia-driver which results in slow
scrolling in Firefox on particularly launchpad.net, because of software
fallbacks being triggered in Xorg. That's a different issue, but the
slowdown sometimes occuring in 2.6.32-26 after suspend/resume makes this
issue much worse, with extreme lags when Xorg is using 100% CPU.]

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Performance drop after suspend/resume cycle
https://bugs.launchpad.net/bugs/671932
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