Talonman
I also noticed the new Physx runtime increased performance for me too and I do not even have a separate GPU for physx!
Nice screen shots, just a shame you are using Keyboard and mouse as the Xbox360 pad does make this game really entertaining!

Pontos
Have you also enabled the multithreading in the ini file too?

Check the UserEngine.ini located in your My Documents\Eidios\Batman Arkham Asylum Demo\BMgame\config

You should see the following
Code:
[Engine.Engine]
PhysXLevel=1
Language=int

[DevOptions.Shaders]
bAllowMultiThreadedShaderCompile=True

John