OpenSuse 11 - Compiz slow in KDE 3.5.9

I have 2 computers, one equipped with a Geforce TI 4200 AGP graphics card and th second (the newer one) equiped with a Geforce 8800GT graphics card (from Gigabyte), both with the latest graphics drivers from NVIDIA (96.43 & 174.09 respectively).

Both systems are running OpenSuse 11.0, with all updates installed.

I observed that compiz is running in a slower way on the 8800GT, with interruptions in the animations (not crashing). On the TI4200 I have not problems, compiz is running smoothly.

Any ideas or suggestions? Your help will be appreciated!