i also did some other stuff
what i did:
i updated the game. but patch was not working at all. game was still unplayable.
i edited 2 config files. you may find them in
steamapps/common/call of duty black ops/player
there are 2 files. config.cfg and config_mp.cfg
in both confing find
seta r_multiGpu "1"
seta r_multithreaded_device "0"
and change them to
seta r_multiGpu "0"
seta r_multithreaded_device "1"
save configs and play the game.
Hope this helps. Also, as for my game settings