The performance in Mac OS X Lion using the 1.1 version, is in almost every game I have played extremely bad in full screen. In a windows, everything works perfect, but the second the new full screen system is used the performance drops.
The only game I managed to get working good was Warcraft II. Duke 3D, Pinball Dreams, Theme Hospital, Transport Tycoon and more, they are unplayable in full screen. But in a windows they work fine.
Plus Red Alert has decided, even with the 1,08 patch to go black on the map again.