same here. insane. had the Blacksmith UI open and went away a couple of minutes. when back on my PC my GPU was at 100% over 75 °C.
capped my game at 90fps and 60fps in background
imo the game is not optimized good. seems they released to early. a lot of stuff missing or technical issues.
and its reproducible. Open MSI Afterburner or NVIDIA overlay. open UI + 20% CPU.
then go to the blacksmith instant 100%
Edit : When i disable the Nvidia Low Latency the GP also goes up.