Xp-erience.org reports this is an excellent .pdf file sent in by moonboy and created by Daniel Keller, TASCAM Sr. Product Specialist !

It covers tons of important tips and tweaks as well as many guides.

"Windows defaults to continual logging of Input and Output data to your hard drive. Disabling this will free up some resources. To disable performance logging, go to the Start menu and select Run. Type in diskperf -n and hit Okay.Write Behind Caching! Optimizing Windows 2000/XP Audio