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A few months ago, we started testing a number of performance changes on our beta server. At the end of last week, the physical server that runs the beta server code had a major crash. Unfortunately now that we’ve recovered the server, we’ve discovered that there’s been quite a bit of data corruption, so we’re having to revert back to a clean install.
This means that the performance improvements that were on the beta server have been removed for the time being. Those improvements (along with some other big improvements we’re working on) will come back soon, but for now they’re not available.