Just checked. Already had most of the options in Windows XP set to best performance. I changed the font rendering as you have on the site, maybe 5 seconds faster.. For sure it improved basic windows load time, hah. The only other thing in the background is the Fujitsu Scan Snap & Google Talk (on that pc) - 2gigs of Ram, Pentium 4 w HT.
Luckily the other 3 computers aren't being used by anyone who needs to access pharmacy lists or eRX. My desktop is a Dell, quad-processor with Windows 7, pharmacies are only 2 seconds on mine, same w eRX, pulling charts is slower though.
Really annoying since Version 5 didn't have any of these issues.
My next step is a clean upgrade to Win 7 either tonight or tomorrow. I'll update on any improvement, since its the exact same hardware.