all the pack oxen that dont vanish when the players log add lag as they have to be loaded onto each players machine when you enter the line of sight
parties that have more then 15 people with maps on to keep from getting lost all cause lagkill your maps and it will decrease as well as keeping parties to around 8 or so we found was best to pose the very minimal
all the visual spell effects that though they look great on all spells,but some just shouldnt have lasting visual effect
some should i.e barkskin,stoneskin ,darkfire,flameweaponsome shouldnt i.e shield,the elemental protects
the oxen are the example of placeables the server has to keep track of and makes it work harder to make sure they are there to be seen when you run by them ,that could be used during a battle in the mines so to speak