Test:
Results: 84 FPS
Settings: Vsync Off, Default w/all options Off, Environmental Slider = none, Clipboard away
Location: Tower A1, CraterMA
Edited: There was 3 fps gain from putting Clipboard away. Note* FOV was 90 (~77 fps); default FOV 80 (~84 FPS!)
All in all, 10 fps gained from putting clipboard away and using default field of view.