I have drastic drops in performance (from 60fps to 20) occurring during certain transitions in-game. On the tank range, I'll get 60fps in the daysight and gunner's station, but if I go to thermal, then return to either, it'll regularly drop to 20. I've had the same performance drop transitioning to the "Events" view in the AAR. Interestingly, using the Windows key to pop in and out of the sim often (temporarily) fixes the issue. The thermal view, regardless, seems to always maintain its FPS. I'm using Windows 8.1 on an up-to-date Asus G750 (i7, GTX780M etc.) and McAfee antivirus. Please help! Love the sim.