FYI - Batman demo to download with PhysX...

[RPGWiZaRD]

BTW where did you enable PhysX mao5? Because editing \Engine\Config\BaseEngine.ini and PhysXLevel=2 won't enable it at least. I just checked, got same FPS as with PhysX turned off in the launcher with PhysXLevel set to 2 in the ini file and clearly didn't see any difference.

Here's the case for me at 1600x1200 and AA4x:

PhysX off, average FPS is around 90 FPS
PhysX set to normal or high in the launcher: avg ~50 FPS
PhysX disabled in the nvidia cpanel (CPU does the job): ~13 FPS