yes I found it interesting - its not the "areas" that lag me around lairs, and its only stepping across those rune entrances in *all* lairs I've been too that gives me that "freeze game" for a few seconds.
And I've heard of others seeing various lairs (community projects and personal ones) that are "blocked off". Usually they are told to just relog - but apparently it is some random looking bug thing.
As for Teir VI - heh, even if the resources were plentiful and all the abilities were in I STILL wouldn't undertake such a Hall. But I hate crafting :) - I think we probably won't have anything above Tier IV in our lair (but that's because me personally the teir V lairs and halls just seem TOO big for my personal preferences and not as 'cozy' - I really don't need THAT much - and hate crafting) :).