I don't use compiz at all (fluxbox), and I am affected by this issue, so I think it isn't compiz' fault. I believe either the X server, the nVidia driver or the kernel are at fault, not flash itself, since WebM videos and general scrolling performance (especially in chrome) are affected as well.
In response to Martin Karpinski:
I don't use compiz at all (fluxbox), and I am affected by this issue, so I think it isn't compiz' fault. I believe either the X server, the nVidia driver or the kernel are at fault, not flash itself, since WebM videos and general scrolling performance (especially in chrome) are affected as well.