3D Spotlight has updated their Windows 2000 Improving Compatibility/Performance guide.

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.

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