If I turned away so that the Atlas was not in the field of view FPS would shoot back up to 50. Tried engaging it again and it dropped to 8-10.
As long as I didn't look at the Atlas I was able to play as normal, even destroyed a Catapult and Hunchback as long as I couldn't see the Atlas. But even catch a little glimpse of it and the FPS went through the floor and the game turned into a slide show.
I don't think there were any smoking wrecks near the Atlas, as one of the other bug reports suggests that might be the cause. I know for sure the Atlas was not smoking, it was untouched when the FPS first dropped.
Running i5-3570k 3.4ghz, gtx560ti, 16gb RAM, Windows 7 Home 64-bit.
Edited by PanchoTortilla, 15 December 2012 - 09:48 PM.