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http://docs.info.apple.com/article.html?artnum=106154
Appleの公式アナウンス。
TITLE
Mac OS X: Optimizing for Earlier ATI Graphics Accelerators
TOPIC
Movies and 2D graphics perform better at lower color depths when using Power Macintosh computers with earlier ATI graphics chipsets.
DISCUSSION
Symptom
QuickTime movies may play with a lower frame rate than expected. Games and other software that utilize hardware graphics acceleration or OpenGL may perform more slowly than expected.
Products affected
* Mac OS X 10.0 and later
* Power Macintosh G3 (Desktop, Mini Tower, and All-In-One models)
* iMac (233, 266, and 333 MHz models)
* PowerBook G3 Series
* PowerBook G3 Series (Bronze Keyboard)
* iBook (original)
These computers include one of these graphics accelerators:
* ATI RAGE II+
* ATI RAGE IIc
* ATI RAGE Pro
* ATI RAGE Pro Turbo
* ATI RAGE LT Pro
* ATI RAGE Mobility
Solution
Lowering the display color bit depth to thousands improves performance of some movies and applications.
1. Choose System Preferences from the Apple Menu.
2. Click Displays .
3. Click the Display tab.
4. Choose Thousands from the Colors pop-up menu.
Use the latest version of Mac OS X for best overall performance and feature set. Further Mac OS X support for the graphic accelerator chipsets listed above is not planned.