The transparent glass in Windows Vista computer can look very nice. However, on some computers that have underpowered video adapters will see a performance hit when running the transparent glass effect.  One way to speed up Windows Vista and still get the benefits of aero, such as flip 3D and taskbar thumbnails, is to disable glass transparency.

1. Click on the desktop and select Personalize.
2. Select Windows Color and Appearance.
3. Uncheck Enable Transparency.