Sometmes i thought it had to do with the Soundeffects that were played - i use the X-Fi Titanium with the latest official Win7 x64 Drivers in Game-Mode.
Also Heat Vision Slow Down is back when playing a while and heavy Lurm-Usage is also again a FPS-Killer.
I had to tone down my Video Settings to mostly Medium to get good FPS from almost Very High i could use when you had the optimizaton patch.
Edited by Thorqemada, 15 May 2015 - 07:25 AM.