AA basically increases the number of textures that have to be processed by your video card, if you put it on 2X you get twice as many calculations, 4X means four times, and so on... so basically its a huge weight off its back if you completely turn it off.
Also try turning HDR off specially if you have AA on. Putting Grass on low means your grass will disappear closer to the camera, this is good specially when you zoom because when these overlap they will create lag.
lower the resulution will mean less pixesl to process, this will definately give you big boost.
make sure to use Shader model 3 (low) not (high) it will give you at least 10 fps boost.
gl
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