After searching for days to find why my computer with 6g of RAM and 640GB hard drive space was having horrible fps lag I found that task manager was automatically reverting the priority of guildwars to low even tho I was only using 8% of my computers over all resources according to the resource moniter.
This let me know it was a software problem not a computer problem.
After manually setting the game to high priority it would run great for about a minute, then automatically be set to low priority and revert to the 5 FPS per sec.
To fix this simply push cntrl + ALT+ Delete and go to the proccess disable any proccesses not being used & then go to services and disable "multimedia class scheduler" as this is the program vista has that automatically changes the priority of your multimedia programs to "INCREASE"(lol!) computer performance.
Hope this helps some others dealing with this issue.
L

