yeah, that doesn't surprise me too much. those machines have integrated video instead of real graphics hardware. basically drawing the frames on the screen is killing me on the mac side right now and i haven't found the time to rewrite display in a mac-native way. that's probably what's pegging the cpus. well, if you found something that's working for you, then that's great, but i will take this as more motivation to fix the video drawing issue on the mac side.
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