WoW start lagging when cursor is on item

Hey guys! I have a frustrating problem. It happens only in servers other than Icecrown. When i put my mouse cursor on any item ( in bag, loot and character window) the game start lagging very much. It is weird that it doesnt happen on Icecrown server. Im currently playing on Lordaeron so its quite frustrating... I couldnt find any help on the internet or on the forum. I have cleared the cache folder but the problem still exists... Looking for your helpfull responses :)