Well this KB is new to me, but worth pointing out anyway especially if you have a solid colour as your desktop background.
Applicable to Windows server 2008 R2 as well.
For more information on speeding up your computer try the following.
- Optimize Windows 7 for better performance!--title-->
- Turn ReadyBoost on or off for a storage device!--title-->
- Performance and maintenance!--title-->
Originally spotted on Softpedia