actually the logic of your analysis is false... the system does not "search" for post x... the index of your forum is clear and the system knows where the post is located, it does not have to browse all of the posts to seek them.
also, 5 millions posts is not that big... i suppose your server needs optimization, but that's not major... i had to reconstruct the biggest vBulletin forums on the market and i can tell you that it's more easy than thought.. just need to be done the right way.
instead of deleting, you may have to evaluate an expert optimization...
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