When I'm on clear skies I easily get 90FPS without a problem. When I change the weather to overcast, the CPU time jumps up while the GPU is still low. The video settings etc. do not matter at all, the game keeps running at 60fps in the rain. CPU usage is about 25%. Thanks for your help. Oculus Rift GTX 1080 OC I7 8700k @4.7Ghz 16GB DDR4