[Eighty Swords]

I was fighting some monsters today and thought about something that could MAYBE help reduce server lag if this could cause some or if it's not already implemented. My suggestion is to edit XML spawners in such a way where monsters would only spawn when someone is within X tiles of the monsters spawn range. After I thought of it I can half remember maka saying something about doing this back on XUO.

Is this already how it works here? If not would this help reduce some lag?