Weird mouse speed behaviour

Whenever I build and run my game, my mouse speed/sensivity is very low when I run the game.exe. However, I have normal mouse speed when I run the game in the unity editor. As far as I know I haven’t messed with any options. How can I change the mouse sensivity to normal again?

Edit: When I run the game with Fastest graphics instead of Very High, the mouse speed is normal

Sounds like to me that that’s the norm. The higher the graphics, the slower the game runs i.e. camera motion.