SloMo

Puts Everything in slow motion, including game time, except sound.
Works in any gamemode.
Yes, It can be used to make your game fast too.

Mutator = SloMo

Mutator Default Speed = 0.4
Game Default Speed = 1

To Adjust Speed (Server Side) Inside Game.Ini add:

[/Slowmo/Mods/Slowmo.Slowmo_C]
Speed=0.4