Post Processing Usage

Hi, I was watching one of the Unreal Live streams on youtube about Optimizing, I was testing the methods I’ve learned and I noticed something weird :

GPU stats shows PostProcessing at 18ms And Translucent at 7 And Screen Space AO at 6.5

any idea how to optimize those ? I have a simple template ( UE 3d person ) but Graphic Scale is on epic ( except Shadows are on high ).

I should say that I’m new to UE ( game design industry in general ) but I’m a pro in modeling and rendering concepts ( such as lighting elements and all related to those categories )

Thank you for reading.