Compiz 0.8.9, NVidia card, anti aliasing and jkmeter vu meter : laggy

[nadstaky]

When I run compiz 0.8.9 without antialiasing, everything runs smoothly. When I turn on Nvidia anti aliasing, I've noticed that the vu meter Jkmeter makes my windows lag when I move them, though the cube is really really smooth.

With Anti aliasing and no jkmeter, it's smoother, but not perfect.

P.S. : I have a NVidia GT 555M on my laptop, and a GTX 680 on my desktop. Both will stay on the higher performance level...