Haven is split up into the Bazzar, Garrison, Arcade, and Town Square. Now, I know the arcade is through tunnels, which might cause some problems with what i'm about to suggest, so we can leave it out for now. But besides the arcade, why not combine the Bazzar, Town Square, and Garrison into one? there aren't enough people in each at once to create enough lag to be a problem, and size isn't a problem either (it can't be more than 1/4 the size of a clockworks level). Plus, it gets rid of those pesky loading screens when going from the Bazzar all the way over to the Garrison. Maybe they'll need to add more Haven servers overall, but that shouldn't be that hard.
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Because most people's computers and SK's servers wont be able to handle quadruple the amount of pre-rendered land and real-time updates of all the players.