I’m getting extremely slow performance (2.5 fps from glxgears) from my GeForce 6200 card with 512 MB RAM running on Ubuntu 12.10. I actually have to run Xubuntu as this performance Unity will not run past the background on my screen. NVIDIA software version was 304.48. This used to work a few revisions ago very, very well.
Yo u don’t find, that you should give more relevant infos?
glxinfo | grep -i opengl cat /var/log/Xorg.0.log
would be the absolute minimum.