To cut load. I'm not sure it helped much though, so I may not keep it.
Er, that doesn't seem like a good reason to downgrade the UI of something important. I don't know how much money it takes to keep HN running, but would just buying ten times as much computing power really be a significant expense for YCombinator, compared to the dealflow from HN?
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Farther in the future: HN's arc webserver uses simple flat files for storage, so moving from one host to two is probably a big context switch as well. I wonder what the current server's specs are, and how long we have until that kinda-sorta-Y2K-like barrier.