I have I9900K and 64GB Ram and a RTX2080ti and monitor 2560x1440.
The game works great. Never had any crashes and I'm usually around 95-105 FPS.
But the game do freeze for a sec when worldsave occours and in my big building my FPS goes down to 20-35 FPS.
So big building and terraforming will results in low FPS even on high end computers.