Proba poner esto al final de tu xorg.conf:
Section "Extensions"
Option "Composite" "Enable"
EndSection
Y si no ayuda mira esto que encontre, talvez te sirve de algo

nvidia SuSE 10.2
I disabled xgl and followed the native nvidia instructions here:
http://en.opensuse.org/Beryl#Beryl_with_nVidia_drivers_-_no_Xgl.2FAIGLX
The bits that seem to do the trick are:
nvidia-xconfig –composite
nvidia-xconfig –allow-glx-with-composite
nvidia-xconfig –render-accel
nvidia-xconfig –add-argb-glx-visuals
All the stuff in ccsm now works smoothly and without jerky movements.