Twins boss performance and view problems

During the Twins boss fight I find this bugs:

  1. Is impossibile to use all the area because if you go on bottom-left then half of the view is hided by the black-cutted stones and character is invisible. I died 2-3 times for this problem.
  2. When the boss makes the purple bubbles appear and when it hits the ground creating the stone waves the frame rate drop from 35-40 to 10-15 FPS

(PC SPEC: AMD Ryzen 7 7700, Radeon RX 580, 32GB RAM, NvME)