[Wine] WoW: Low FPS

[McKinnon]

When I start wow and get logged into my character, my FPS will be high, like 75, then after 30 seconds or less maybe, it will drop for 20 FPS.

I've tried all the fixes I read about on the WoW WineHQ page and thats how I got up to 75 fps for that short while (before, it was like 35 fps, which dropped to 15 fps)

Some info on my setup:

Ubuntu 9.04 (64 bit)
Kernel 2.6.28-14-generic
Wine 1.1.26
Intel Core 2 Duo 2.5GHz
NVIDIA GeForce 8600M GT
4GB RAM

Any idea why my FPS drops after 30 seconds or so?