Has anyone heard of a feature whereby display processing power is linked to system power levels ?eg.: if you're operating on battery rather than wall plug, can that have an effect on whether you get full acceleration when watching videos? My sister claims that, on her Mac, when the battery is running low, the video will not be as smooth (choppy, audio cut-outs). I think this is complete nonsense, but it's occurred to me that it is not totally impossible that a computer system might disable some high-performance features such as video acceleration in an effort to conserve battery power. Anyone ever heard of the such a thing?