After 3 days of optimizing it, it runs much much better but unfortunately in some areas there will be a framerate drop. Witcher 2 tech jumped a lot ahead and they tried to make it better with very linear and much more up-close environmnets. For example you can leave flotsam only via few small doors which load/unload a lot of objects, I did not think about this when designing the level so most of the time there are several open paths to every location and the distance between them is quite big and more realistic, thus I need to load a bigger amount of objects not only for the distance. In such areas like the forest where there is a lot of trees that use wind simulation the framerate will be lower. I think that people who can run their desired setting on at least 40+ fps wont feel it, though I don't know about people with low-end rigs.