Works great, thanks for the tip. The game performance is good. Maybe
deactivate AA and shadows.
I have deactivated everything possible, even edited the config file by hand to turn off everything I could (you cannot turn off everything from the menus). Still I get average 15fps, sometimes only 10, if nothing much is happening, maybe 20. (You can measure this with /seta cg_drawFPS "Simple" console command).
I have 3GHz core 2, 4gb ram, nvidia 260gt, COD:MW2 runs just fine.
Resolution has no effect, Same fps whether I use 800x600 or 1680x1050, fullscreen or windowed, tried to disable / enable UseGLSL in registry, no help.
(Btw, I have had these sound issues lately in many games, the above spell seems to fix them usually.)
EDIT: I have steam version, if that makes a difference (or can this be even played without steam?)