From 13 to 33 fps with these launch options

[kartog22 10]

here is a link, i don't want to take credit for other peoples work

http://www.battleguns.net/forum/m/7737561/viewthread/6153624-arma-3-cpu-optimization-low-fps-fix

I had 12-18 FPS , tried this and it worked like a charm

Also you can get some more FPS if you set the game in Windowed mode- gave me 5-7 fps