I haven't read anything in this except the dev posts. But somehow I feel that entitles me to posting my opinion anyway.

I know there are occasional lag spikes that effect everyone but to me they are unusual, client lag is far more frequent. And I have a primary suspect.

Last night I had horrible lag in ToD. Horrible. But I was the only one, and it didn't take me too long to narrow in on why: dndclient.exe was using over 1.2 gig of mem. I was fortunate to be able to complete the quest at all.

My girlfriend has similar issues, when she zones several times her frame rate slows to a crawl and eventually her client crashes (BSOD).

Something about the log out process does not free memory. Ditto the zoning process.

Memory leaks = Client lag

BTW the leak seems worse after Update 9 but I have no metrics, maybe I am just imagining that.