I'm using the rMBP and using the multiple desktops (or spaces, or whatever they're called). For example, I'll have mail on the on desktop, and Safari on another desktop, and Photoshop on another. If I using the trackpad swiping gestures to move between them, then the smoothness seems fine. But if I move between desktops by clicking on the app in the dock, then the moving between desktops is very jerky. Why is this? Is it because the graphics cards aren't being used properly?