1680x1050 ? Really?
You must be kidding... You really expect to have perofmance at that resolution on a game clearly optimized for nVidia cards? Try a lower resolution than bump up and experiment with the AA and AF, also try to work with the rest of the driver settings.
One of the aspects I observed on the performance issue was that when on a level with a heavy(and long) flashback scene the fps were dramatically decreased. So I think that's one of the major problems - the flashback/present environment corelation.
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