nope there is a difference.
the post count on forumhome has just to look how much rows there are, that's very fast, the lettercounter has to visit each row and sums up the postlength.
it's like the combination of the 3 pm queries into one.
i've seen on several tests, when you have a lot of pm's the three queries are much faster than the one, because the one query version has to go through each row for the if clauses.
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