I've started logging out in the home servers or freeport then logging back in there seems to keep the lag down. I've reported it to support as well. If I hear anything I'll let you know.
I have told everyone same advice dont logoff on the expansions but the main server is nearly always full so its forcing people to stay and log in an off expansions so I hope it's fixed soon I hazard a guess at we have to wait for a new client update