I'm not sure how many of you know this, but the capital cities are instanced. If you zone in from from your housing plot for example, you are placed in one of potentially several copies of Thayd. I am pretty sure the devs said they would not use this kind of instancing in the past. It really bothers me, because it breaks the feeling of being in a large persistent world. Thayd is vast enough and there are several copies of AH/banks/CX that using this for better performance is not a viable excuse, in my opinion.