Extreme performance drop after starting the Phantom Libery quest

Heres my spec: NVIDIA GeForce RTX 3060 Laptop GPU 11th Gen Intel(R) Core(TM) 15-11400H 2.70GHz With 16gb ram

In my main game with everything in low setting i can easily achieve 80-100fps no problems

But now im running the PL quest and everything is on 30-40fps, stutters audio makes the game feel so buggy. Any one experienced this? And is there any fix?

Ive tried running game files integrity on steam even changed the graphics settings but nothing changed. It even removed the fullscreen option for me now im stuck at borderless window mode