humantarget,
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IIRC this particular slowness was due to running out of VRAM and the resulting swapping. Think of a windows system running out of physical memory and you get the idea (except that in this case the VRAM is being swapped to system memory. It isn't as slow as HDD but still slow). OS X does have better VRAM management. Obviously this is one area we're attempting to improve. This can be worked around somewhat by reducing the eye candy and in extreme cases (16 or 32MB VRAM) reducing the resolution and or screen depth.

Assuming you don't run into this situation MorphOS quite easily runs circles around OS X in most areas. I am fairly certain there are numerous users who can back this up.