There has to be some driver problems with nvidia. My 2D game got a strange slowdown after i installed a new version of the drivers. Since then i tried to install the lastest drivers (yesterday was my last update) but the slowdown is still there. My game pauses after i change from one screen to another, like going from menu to the game. That's where the whole screen graphics is drawn again,should be really fast on new graphic cards. I am using directx7.