I recently upgraded my PC to Windows 10 and transferred to the Steam version of rf2. After these changes I have lost 40-50 fps at my preferred graphics settings. Has anyone else experienced such a drastic performance decrease after upgrading to 10 or switching to steam? Unfortunately I got rid of my old, non-steam installation so I can't compare the two. Other games are unaffected. Graphics hardware is: GTX 670 x2 sli (365.10 WHQL) I run triple screens spanned with surround @ 6000x1080. Same settings as before in inspector and nvidia CP. Edit: I was able to get most (but not all) of my frames back in fullscreen mode by using the following settings from WhiteShadow's post below: In NVIDIA Profile Inspector: SLI compatabiliy bits: 0x02402004 Number of GPUs to use on SLI rendering mode: SLI_GPU_COUNT_TWO NVIDIA predefined number of GPUs to use on SLI rendering m...: SLI_PREDEFINED_GPU_COUNT_TWO Thanks to all who posted!