2nd Gen Macbook Pro here and the game is virtually unplayable in both OS X 10.6 and Windows 7. I even tried the JDK 7 in Windows, but the game just lags too much to play. The inventory screen is just painful. The item I'm dragging can't even keep up with the pointer. This is Windows 7 32bit, BTW.
3GB RAM. I've been able to place Starcraft II, so I know the video is decent. What's going on?