How do i set the speed of the default PlayerController?

I feel like my character just moves way too fast. I use the default FPS Controller. Except i removed the projectile and the fun. How do i change the speed of the Controller?

Character speed is defined in the Character (the class Character), not the Controller.

Open the character’s blueprint, in the defaults tab, look for the section “Character Movement”. There you’ll find MaxWalkSpeed, which is what you want to change.