Penumbra Requiem low FPS on good pc

[plutomaniac]

Waiting a bit for the level to 'pick up', so to speak, also seems to solve the problem.

I did that and it worked. I played like that for 3 minutes and since then it is ok. No idea why this started. The errors in the HLP.log are also found at Overture and Black Prague ones so it shouldn't be Requiems problem.