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#21
In Windows 7 Aero is handled by the GPU. Windows basic is handled by the CPU. Therefore Aero = more processor time available. because the GPU is dealing with it.
Dont believe me? Look on the back of any graphics card box. "Optimised to run Windows 7 Aero" (Yeah I know they would say that anyway... but in this case its actually true )
Vista on the other hand, it was handled by the CPU, thats probably where your getting confused.