Maybe a good way to decrease lagz is by stack a mob and have it set up so the same type of mob in a compacted area it will get a name tag stating how much there is on that one mob but if a player uses a certian command the mobs will split to reduce alot of lag so for example:20 zombies in a 2x2 area= 1 zombie name name taged saying 20 x zombies but if a player is looking at them and types /split (or somthing like that) they will seperate and never rejoin together P.S. thx for reading this idea