Wanted to just post this here as I've seen similar posts all over here and on the wow forums and I resolved my issue by backreving the drivers to 353.60
Working on Hellfire Assault. My framerate tanked down to the point where the game was unplayable. 1fps, frame by frame action. The card was pushing out an abnormal amount of heat.
I am using Windows 10 and an Nvidia GTX 770 card. Rebooted my machine and sat in the garrison and noticed that my frame rate was at a steady 60fps. I didn't think anything of it till I went and checked my vsync settings. Vsync was disabled and I was still getting 60fps. Then I noticed my fans were speeding up to max which was abnormal for my workstation.
I rolled the driver back to 353.62. Logged back into game and my frame rate went back to normal, the temps on my card went back to normal.
191fps sitting in my garrison.