For those with mouse lag

[xman1]

I found that lower shadow detail to be the biggest help.

Lighting detail is the second best thing in helping relief mouse lag, though shadow detail is likely the best way to deal with it.

Hope this helps.

-X

[gt_magnus]

Yeah, shadows are always performance-killers...

[R33GoNe]

I have found that anything over 1/3 on shadow detail causes me random performance drops but only on the menu and it's not my computers performance thats the problem either. I have added my findings to the report on the feedback site to help BIS to track down the fault.
Took me while to realize that is the best way to report our problems/findings as I've never been part of a beta before.

[Max Power]

I found that turning down the PP detail and turning down the terrain detail one notch increased the performance quite a lot.