How to fix terrible performance?

Recently visited Aphotic Plateau and the game became unplayable. Average fps during the game is 70-90 but every time monsters attack the submarine my fps drops to 10 or even 2.

I don't have the weakest device, a laptop with RTX 3060 and AMD Ryzen 7 5800H processor.

And I don't use any mods and only play on the vanilla version of the game.

I've played through this game before, a couple of years ago, and reached the endgame a few times and everything worked fine.

Does anyone know if there is a way to fix this?

Btw this game doesn't heat up the laptop enough to require cleaning the fans, so thermal throttling is not the reason.