Okay, this probably falls into the "No Sh*t, Sherlock" category, but sometimes the easiest tweeks go undone.
With the myriad of solutions/tweeks being presented, I don't think I've seen this one posted. If it has ... sorry.:rolleyes: Seeing how the game controls all of the AF and AA features make sure your Vid Card control software is set to "application controlled" for both AA and AF.
Not claiming to be the be all/end all solution, but it may get you a few more FPS.
Carry on ...