If you watch the world and zone servers boot up with Debuging set to 5 and watch the output you will notice that the one thing that slows down the world server on start up it Loading the Items. At this point it is loading the items into shared memory. Now, if you watch a single zone server instance boot up it will breeze by the loading of the item, because they have already been loaded into shared memory, at it will sit on loading loot tables for a little while (depends on speed of server) then it will breeze by the rest and connect to the world server. Now if you load up a second zone server instance you will notice it will breeze by the loading loot tables part because they have already been loaded into shared memory.
Also LootTables are associated to an NPC so if they are not assigned to any NPC then they will not have any affect on the the load time of the zone (when zoning into a new zone) itself since NPCs are loaded based on spawn groups for the zone.
Now I still believe that we do not need lootgroups floating around that are not assigned to NPC's and cleaning these up are a good idea it is just a tedious process of find out if it should be deleted or needs to be assigned to an existing NPC.
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