Freezing / unstable framerate issues?

[Mudbill]

Different engines handle games differently. Battlefield is probably optimized pretty well to avoid such. It MIGHT be OpenGL, but it might also be how the game is made.

But do try to turn SSAO off. Having it any higher than mid will likely only wreck your FPS regardless. It's somewhat of a bugged feature if I remember correctly, where it was not supposed to even be possible to put it that high.