Quartz 2D Extreme
From Applepedia
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What is it?
Quartz 2D Extreme is an acceleration technology which offloads most graphical computation from the CPU to the GPU.
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Do I have it?
Not at the moment, it is disabled by default in 10.4.2. Q2DE requires the ARB_fragment_program OpenGL extension, which limits it to the ATI Radeon 9600 or the NVIDIA GeForce FX or better.
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How do I enable it?
If you would like to test Q2DE, you can enable it via a menu item in Quartz Debug. It will be disabled when you quit Quartz Debug normally. If you would like to enable it permanently, open /Library/Preferences/com.apple.windowserver.plist and change Quartz2DExtremeEnabled to Yes.
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More Information
Mac OSX Hints article: Permanently enable Quartz 2D Extreme
