I can’t play since the new patch 0.4.0b.

Since the release of patch 0.4.0b, I haven’t been able to play because I’m experiencing serious performance issues that I didn’t have with patch 0.4.0. I’ve tried all possible graphics settings, but the game is unplayable. FPS doesn’t go above 20–40 after the patch, while before I had 60+ FPS. I don’t know if this is only happening to me, since I haven’t seen many other people complaining about it. By the way, I’m an NVIDIA user.