Fluidity of the interface ?

Hello, can you tell me if there's a way to make the interface of the stock rom more fluid ? I found it kinda sluggish compare to my old phone.

I haven't root the phone yet, but I saw that some xposed does work... what is the problem with that phone ? I mean even just going from one menu to another seems sluggish =T (and I set the animation to 0.5x) :confused: