The 8 Meg video card on the first generation TiBooks is just BARELY able to support full screen mode on the wider screen that the TiBook has when you check the "Economize video memory" button. If you switch to thousands mode in the monitors control panel you'll get better performance. You can also reduce the shimmer setting to improve performance some, but the bottleneck is your video card.
The application has more freedom with what it can do to get better performance than we have in the screen saver framework.
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