I'll have to try the omega drivers tomorrow when i'm playing with this issue. I also posted a thread on the wow forums and I definitely have the issue isolated down to resolution scaling when maximizing a windowed mode session. If I launch the game at true 1680x1050 windowed mode I get perfectly normal fps. Yet if I launch the game at 1680x1018 which fits perfectly above the taskbar I get the fps issue. I have a running thread on the wow technical support forums. I've already received 4 blue replies which suprised me but this also leads me to believe that they are very aware of this issue and are trying to get more information to isolate and resolve it. I'll post more information as I recieve it but I at least have a solid work around. I just have to deal with not having a taskbar visible.

Here is a link to WoW forums post. I'm Cthulhu:
http://forums.worldofwarcraft.com/th...sid=1&pageNo=1