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0f7b58d
(Get the code!)
Limiting screen redraws just means we're on the edge of what the hardware is capable of, so you need to get desperate and creative. That is assuming we're on the edge of the hardware's capabilities (please answer comment #4).
Regional (sub-screen) updates should be avoided because you need to do full screen buffer swaps to take advantage of the extra smoothness that triple/double buffering provides. Certainly in Compiz, avoiding regional updates and just doing fullscreen page flips actually improved frame rates in the majority of cases. However that's different to skipping rendering on specific monitors. You can do that without being penalized...