First, there's no mouse acceleration. I know some (most?) people don't want it in an FPS, but I really can't stand how the mouse behaves in this game. Mouse acceleration is there for a reason, which is to increase precision. Low sensitivity requires huge movements and high sensitivity is too imprecise for a shot. I don't know how people play FPS without mouse acceleration, but personally I can't. I also feel some mouse lag, which makes things worse.
Is there any way to fix that ?
Also, antialising is ineffective, regardless of the settings. I don't know what's with the geometry in this game, but aliasing makes it look particularly awful.
Overall, I though it would run better given it's relatively low graphic quality (compared to, say, the new Tomb Raider).
Right now, I'm not sure I'll finish the game (I have just started).

Any help would be appreciated.
I'm on an 2006 Mac Pro (2.6 GHz), radeon 4870, OS X 10.9.3.