It shouldn't be doing that. The idea of having hardware accelerated compositing is to offload some of the burden on your CPU to the GPU. I find that as long as I have RenderAccel enabled in my video driver and vsync enabled in compiz, I can watch unaccelerated video (f**k Adobe for not enabling hardware accelerated flash for my card) in full-screen without a hint of choppiness, which is something I could never do without compositing enabled.
Originally Posted by superppl
I can both watch video and play games with Compiz enabled.
I really enjoy the convenience of nvidia
No it shouldn't, not unless if you have tons of eye candy enabled.
But with just compositing alone, minus demanding eye candy, it does save you system a lot of stress.