I have a similar problem. After an upgrade to MYSQL, this mod is killing my server resources. It seems to be the query that deals with private forums. If I disable the mod, the board flies. If I activate it, it comes to a crawl at peak time (300-400 members online).
I had a similar issue last year when mysql was upgraded, but one of our server techs seemed to be able to optimize the DB enough to make it work. No one seems to be able to help this time.
Rats! I have gotten so used to this great mod and I have to turn it off, but what else can I do?
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