The only thing that comes to mind is by default the movement component support replication by default so if you have no need for network features you could try turning it off.
Normally I would suggest running a profile as FPS alone does not say much as to what is actually causing the performance hit. Since I’m not up on what can and can not be done as far as mobile goes I’m not sure of the process you would need to preform. If possible you could do a with and with out profile and see just whats causing the problem.