10 queries is the lowest I've been able to get queries on a showthread page. This is with NO attachments and NO polls. An attachment(s) will add 1 query to the entire thread, and a poll will add 2.
So if you have 10-13 queries, as a rule you probably don't need any optimization.
For me, so far I've been able to join all queries that do anything on a showthread page except the 2 additional poll queries. They seem to be a little more complicated.
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