i found support for my ati (desktop) cards somewhat bad, however with the new xorg6.8.1 they work great !
it's still not as good as windows, but works much better than xorg6.7 or xfree86 4.3.x
So perhaps installing xorg6.8.1 might give you better performance from you graphics chipset, from what i understand the ati drivers are much better (for whatever reason) with it (xorg6.8.1)
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