Taken from the EQLive forums.
"What's wrong with pulling massive groups of NPCs?
Calculating pathing is an expensive operation. This is true in other applications and it's especially true in EverQuest. That is, the server has to determine how an NPC will get from its current position to a location where it can melee whoever its mad at, and this taxes the processor. When an NPC continually needs to recalculate its pathing, this taxes the processor continuously. And when hundreds of NPCs continually recalculate their pathing, the server has a problem. In extreme cases, NPCs cease to move - not just in that zone, but every zone hosted on the affected server. This can be extremely disruptive to other players."
-
https://forums.station.sony.com/eq/i...hanges.207363/
Leave it "fixed" so this can't continue IMO. More importantly, the devs state before this paragraph that pulling massive groups of mobs to kill wasn't intended.