I'm pretty sure it doesn't, but I was looking over this thread where the OP claims he has no scrolling or UI lag while running in the scaled resolutions (i.e 1920x1200). None, whatsoever, and he's on Lion. The only thing that's different is that he has a 2.7GHz processor. Does that help? I know it has 8MB L3 cache (vs 6MB default) but I don't even know what that does. Bottom line: Does the 2.7 offer any significant performance boost (in terms of graphics) at all? It would help to know if you're a 2.7 user or not since the majority of people have 2.6 and they don't have 2.7 models in apple stores (at least on display).