The CPU but mostly the GPU usage goes bonkers when focusing the main menu.
I have 2 screens and whenever i select the screen with the main menu, the gpu and cpu usage goes up, to the point my GPU literally screams.
Regardless if i have mods on or not.
I don't know since when it started, because i just noticed when i was playing without headphones.
Open the game and stay at the main menu.
Hear the GPU screaming.