Norichan: Thanks everyone, I started playing again today and I really like it thus far - would be a shame to rush through a game like this. Now I only need to find a way to get it to run smoothly, and I'll be set for many hours to come...
Arthandas: Check my topic for some nice performance tweaks:
http://www.gog.com/forum/two_worlds_series/two_worlds_2_tweaking Basically those three tweaks give you free fps because there's no real quality impact other than less grass (which can actually help with finding herbs) :
Engine.ParalaxOnTerrain 0
Engine.StencilShadows 0
Engine.GrassUserMultiplier 0.25
Be sure to run in DX9 mode, not DX10.
Thanks, but I'm having the problems with Two Worlds, not Two Worlds 2 :) Maybe you know something about that too? I already opened a question with the specifics, since I really don't know what to try anymore...