They may be running some re-indexing queries, or optimization / cleanup routines or something. It is, admittedly, worse today for me than it has been in the past few days. Today the board is reminiscent of how slow gfy used to be on the old servers. It's probably temporary.
(I've not checked if there are packet losses or hop timeouts, I'm just guessing here as I have noticed it is slow today.)
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