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1b1ed1a
(Get the code!)
Newfie, thanks for the detailed report.
I can't reproduce any such lag yet. But I have more (slower) hardware I have yet to test...
Do you have ccsm > Workarounds > "Force full screen redraws (buffer swap) on repaint" enabled? Please try with and without that option. There are reasons why that option might give you more, or might give you less lag. It might give you more because it allows compiz to pipeline rendering of multiple frames before they're actually displayed, hence a couple of frames lag. It might give you less lag for the same reason though -- because more of the work is offloaded from the CPU to the GPU and the CPU can better keep up.