"For optimal performance with Application/Games that utilize DirectX API's
(Not necessarily Direct3D) you should ensure that Debugging levels are all
at a minimum level. Debugging can aid in detecting, locating & correcting
errors in an application. This data however is of little use to most users
so you should minimize it as a result for best performance. To check this
you can use the DirectX Control Panel utility."
FULL STORY @ 3DSPOTLIGHT (http://www.3dspotlight.com/tweaks/win2k_compatiblity/index.shtml)