I disable tick on actors as I create them. Good Habit. In general thinking tick evaluation doesn’t have a huge impact. It’s the accumulative of all ticking actors that have the impact. 100 actors ticking versus 10,000 ticking is huge.
Timers have their place. Say controlling rate of fire on a weapon class. You wouldn’t use tick for this even if you adjust tick frequency. You cannot guarantee a specific amount of time with tick. Under production load you can’t force a tick on an actor. It’ll tick when it can… resource availability.