I've been having an issue with Frame Rate ever since I've been playing ArmA 3.
The game auto-sets me to the highest settings, so I doubt it's a problem with my hardware.
Even when I've set the game to its lowest settings, I still can hardly get over 15 frames.
I don't often do Troubleshoots, so let me know if you need any more info.
Here is a link to my DXDIAG.txt