I got some weird performance bugs in 3d apps.
For example in: GoogleEarth, glxgears, sauerbraten

If i start glxgears, my frames seem to be quite ok:

PHP Code:
12356 frames in 5.0 seconds 2471.183 FPS
12907 frames in 5.0 seconds 
2564.860 FPS 
But the problem is that the visualisation isnt fluently running.
So its kinda studdering the whole time.
Same goes for the other Apps mentioned above.

The weird thing is, that Kwin works without any problems.

Hardware: AMD 4200 x2 64bit, 2x 512 Corsair XMS, k8n-neo4 (MSI), 9800GT NVIDIA
OSS: Opensuse 11.1 + KDE 4.1

I hope you can help me

PS: Rendering is ofcourse enabled and the drivers are also correctly installed.