Particle system Fixed Time question

I’ve been trying to optimize my particle systems and one thing i ran into was the particle system update mode, where you can choose between realtime or a fixed time step. I was trying to use the fixed time step to lower the amount of frames it would update, but no matter how low the value i input into the update time fps this isn’t changing anything for me both in game and in the editor. Don’t know if i missed a setting somewhere that should be checked as well but i can’t find anything back about it.
Any help would be appreciated!