Finally got to play some SC2 last night on the OSX side. Hi-res 1680x1050 and used the "high" setting and by default reflections are off so I just turned that on and played some 2v2. Using ctrl + alt + F I can see framerates. I have it capped at 30FPS and it rarely dropped from there and stayed steady at 30fps.. If that helps anyone. Didn't really bother uncapping to see what it ran at, but it was smooth as eggs.