mentaur: I'm having the same issues on my 560Ti. Crysis2 runs perfectly on maximum settings at 1680x1050, but I can't even run this past the jail scene on 1280x800 with everything on minimum. It's a slideshow.
What a disappointment after such a long wait...
k.e.i.n: You can't really compare your performance to Crysis2 because Crysis2's graphics is generally worse that Crysis1's graphics.
If you can MAX Crysis1 and Metro2033 (Both not made to run on console) then you can max Witcher2 (uber-sampling might be disabled).
I don't have uber-sampling on. The performance is identical whether I run the game windowed at 800x600 with EVERYTHING set to low, as it is at 1680x1050 with everything on reasonable. This is just odd. It smells like a driver issue, but even then we should be seeing consistent issues over the nVidia userbase.
I'm not expecting it to run perfectly, but I am expecting more than 10fps, just as all other games seem to manage. I don't blame anyone; I'm just disappointed as I was looking forward to enjoying the game today!
If anyone has some useful suggestions then please go ahead.