Tried 640x400, still the same. Then I tried 320x200, it didn't improve it, just got worst.What happens when you try one of the "green" resolutions? I'm just wondering since 640x480 is definitely not one of them, and it could be just the quit graphic (which is only 320x200) stretching itself to fill the screen or such.
That seem to have fixed it, I enabled it at some point, hoping the fps would have improved.Turn gr_voodoocompatibility off. It downsamples all graphics to a maximum size of 256x256 for some oooold graphics cards that don't support any larger texture size.