I have two processors (both at 2.66ghz). I can have the textures run at high (that should only depend on your video card, right?) But I can't even turn shaders from low to medium without my framerate going from 33 to 14. To me, the shaders are what make the game start to look great. Is there a way to make Starcraft 2 use my other processor?
According to this performance report for Starcraft 2, the game is only capable of using two cores. If both of your processors each have multiple cores, only two cores will be used by Starcraft 2.