There are a lot of topics like this.
It seems that some people with high end rigs (especially laptops) have serious problems with this game (low fps, crashing, freezing, overheating etc).
The game is not optimized yet as it is in early access. And it wont be optimized soon because developers are focused on new content. I guess optimization will come at the end stage of development.
I have Intel i5, 8 GB RAM, Radon RX570 and the game runs just fine at 30 fps at high graphic settings. Never had any problems with the game. A friend has similar stats, with weaker GPU. He runs the game at 60 fps, but it crashes a lot.