Here's my scenario:
Running Windows 7 on a decent rig (see my sig) and I get decent frame rates on Ultra. On occasion I will hit the Windows Logo key on my keyboard to "tab out" and browse the web (Chrome) or do some other things while waiting for a raid to start. I usually have TeamSpeak 3 running as well.
The problem is that occasionally when I go back into Rift I end up getting 1-6fps! I can close out of everything and restart Rift... and I *still* get 1-6fps. The only solution is to reboot my computer.
I'm running a 1TB HD with several hundred GB free. I also have a thumb drive plugged into a USB 2.0 port for ReadyBoost.
Anyone else have issues like this? I'd love to NOT have to reboot every so often.