Strangely enough, I have some situations where the frame rate is great outdoors.
Then I go inside, come back outside, and the frame rate is very crappy.
Does this have to do with the real-time random generation of grass and trees and such?
I noticed this on my PC, but on my XPS 2 as well.
No matter what settings you turn down or half way down, it seems that there is barely any improvement in frame rate for that matter.
Turning of the grass shadows helps well...