Before messing with any settings close down any excess applications you may have open before starting the game.
If this doesn't help try the following:-
Remove or turn down antialiasing, this will really improve performance on a lower spec machine.
Turn down/off the anisotropic filtering
As others have said remove a few of the bells and whitsles, good ones to remove are:-
smoke and dust
cloud shadows
Finally if needs be drop the screen resolution down a notch or 2
Im running on a fully specced Macbook pro retina 15" via bootcamp but output the game to a 32" TV and find it much easier to drive with the big screen
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