Defrag your hard drive. Run Ad-Aware and Spybot. Unplug all USB devices except mic. Unplug all firewire devices. Unplug your USB hub, and connect the mic directly to your computer. If you need more turn off Yahoo, AIM, MSN, torrents, anti-virus, software firewall, and deactivate your wireless network card. If you still need more go here and follow some tweak settings:https://www.tweakxp.com/If you still need more do a search optimising the XP services list. You may want to search for the "black viper" recomended list. In Audition go to settings > system tab. Increase your buffer and cache sizes. Select your biggest partitions for a temporary folder.