It runs poorly on a gtx 1080ti as well. I get the same framerate in red dead 2 at 2k resolution as valheim. If you are getting really bad performance problems lower you screen resolution in the game. Dropping from 1080 to 720 cuts your video cards workload significantly since it has so many fewer pixels to fill. If you have an ssd in your laptop install the game there since the response time is similar to RAM speeds. Couldnt hurt.