Once and for all, the lowered framerate has nothing to do with the environment. The game runs at 30fps because the engine they are using can't run above 30 fps. Trying to pass that as a deliberate choice so they can use more CPU power for the backgrounds is just PR BS and I see that a lot of people fell for it.
-UE3 was (is) designed for 30Hz FPS/3rd person action genre titles. -UE3 brings a lot to the table (nice tools, wide feature set) but imposes a lot of heavy fixed costs -There are also some choices made in the engine that have problematic side effects for 60Hz play -Out--of of--the--box fixed cost baseline (especially GPU) too high for a 60Hz title.
This was discussed to death months ago. Can we drop it now?