Jegriva

Hello everyone, this is my first post. I discovered Kerbal during the lockdown and now I am in the deep hole of the mod world I have a question: when I boot the game, it says that Parallax is set on "ULTRA", and the game runs verdy badly (10-15fps). How do I change the settings to "normal"? In the .cfg file I only see a bunch of numeric values, and no one changes what I read on boot.