I built a new rig and ran ARMA CO on it and it ran great, and then I ran a bench marking mission to check my fps and it was fine. Now a few days later it has horrible lag so here is what I did so far: I have deleted ARMA CO and I am now reinstalling it on Steam, and I have restarted my computer, and soon I will see if this fixes it. another question do I have to mark arma as "run as admin" in steam?