You may need to disable Compiz before you play games, it eats up quite a few FPS this however will leave you with no Unity at all, so if you wish to play games use Unity 2D instead.
WoW runs faster on GNOME Shell compared to Unity
You may need to disable Compiz before you play games, it eats up quite a few FPS this however will leave you with no Unity at all, so if you wish to play games use Unity 2D instead.