I didn't play early access to avoid playing a broken alpha version. Now that I reached Act 3 the entire game falls apart. Massive FPS drops into the 30s and gamebreaking bugs around every corner.
Overrated. Another testament to how unreliable reviews are.
Try setting Clouds to low, and turn off Dynamic Crowds.
But yes, Act 3 is bad, especially at Rivington. My fps was choppy throughout Rivington, and I have an RTX3080