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Economize VRAM helps when you get < 10 fps.
Powerbooks (until recently) had less than stellar video systems, and iBooks trailed them. Since we are getting 90 fps we are rendering 3 times the number required to get smooth animation so the problem isn't pure processing or graphics power, but we aren't getting the processor in evenly distributed time. I'm talking with Apple and I'll see what we can find out. I have a debug build which will tell you the longest wait between draws, which helps to quantify the amount of jumpiness we get in CPU allocation. Would you be interested in trying it?
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