OS: Windows 11 (Build 22621.1413)
CPU: i7-9700K @ 3.60 GHz
GPU: NVIDIA GeForce RTX 2070 SUPER
NVIDIA Driver: 531.41

My CPU was operating above & below ~20% and the GPU at 98-100% in Valheim while on the main menu and while playing.

I mean, although I just did a clean install of Windows 11 and a "clean install" of the latest NVIDIA driver whilst using the installer today, I will run DDU Uninstaller, reinstall the latest driver, and let you know what happens afterward.

Update: Even after running DDU Uninstaller and reinstalling 531.41, the CPU usage still runs a little above & below 20% and the GPU usage 98-100% (61 Celcius).

Now I wonder if it has anything to do with settings "Hardware-accelerated GPU scheduling" & "Optimizations for windowed games" under Settings > System > Display > Graphics > Default graphics settings. However, this is happening to people on Windows 10 as well...