For the love of the Six, fix the Mac client.
Frequent Disconnect
I have been having a similar problem. I am lagging whenever there are players near me, not just in Lions Arch but the game there is unplayable. I usually end up getting dumped back out to character select. If I have a character in a high activity area then at times I am unable to even load up the area without the client crashing.
Incoming fire has right of way