6,000 posts day ? are you sure, that's nearly 200,000 posts per month, the board only has 645,000 posts .....
I suggest they make sure that dateline has been correctly indexed in the post table, and run an explain.
At the end of they day its very poor performance by mysql slowing it down - even if I remove the index on my server, it only takes 1.5 seconds, and that is scanning 720,000 posts, not 645,000.
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