It depends on how many actors you want to store and how much data is in each. At a certain point the number of actors will cause the engine to stutter due to memory issues.
I ran a test where I spawned hundreds of thousands of invisible actors and it is fine up to a point. When I increased the data in each actor to 1-5MB the limit became much lower, though I can’t remember off the top of my head where that limit was at. That was on a fairly decent PC, so mobile is going to have a much lower limit.