Great advise right there.
There is a project (and i think its free) for an endless world situation. I forget the name off the top of my head, but, i know its there and working.
I assume you are talking about the sleep methods. So they are not walking around and using resources to keep them functional. I am not sure if this is something that is automatic, but, there is a way to “turn them off” when they are not in a range.