Once during AHII beta and once since AHII my FR's went into the toilet.
During beta I figured that my old PIII just could handle AHII. But after playing with video settings and getting nowhere, out of desperation I tried the last thing I could think of: I re-installed directx-9. That fixed my FR, probably doubled it. Then, after patch 5 came out my FR dumped again, so I tried re-installing directx-9 and again it did the trick.
Maybe some of you guys who are having trouble could try this and see if it works.
(If it porks your system, I don't know you.)
ra