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It sounds like you modified your forum and are trying to echo out a MySQL result.

Excited is one thing, four topics (with several hours of delay in between a couple of them) is quite another.
Just don't do it again.

Mmm, any idea what causes the usage?

Because the ban message is not necessarily meant to be shown to the general public.
What you're asking for could certainly be written as an extension though.

No, subforums are not a feature of a standard version of PunBB. There is a modification to add that functionality.

Nope, the person just gets the banned tag

He is banned for a day for spamming links to his forum (one in Show Off is fine: several throughout the day in various forums is not).

Queries are not a measure of speed. Take a look at the two page generation times you just quoted, for example, and notice that PunBB is close to 30x faster.
You can have slow queries and you can have fast queries. I could run a query that would take as long as 1000 general queries.
When you have a lot of them and they take a lot of your page generation time, then it's time to look at optimizing them.

And the index page isn't necessarily a good comparison if you're talking about modifications: there isn't some kind of correlation between queries on the index page and modifications. For example, on the index page you linked to I see one query's worth of data that PunBB doesn't include (recent posts). Otherwise, it's the same.

Look at the footer, at the very bottom left of the page

Well, you could grab a copy of 1.3 (which does support UTF-8) from SVN and test that if you wanted, it would be useful to get more feedback on it from a PostgreSQL/UTF-8 perspective. You shouldn't be using that on a production site though, since it's beta software.
Otherwise, I'm not really sure. Adding /u to preg_* functions isn't the only change required to get PunBB 1.2 working properly with UTF-8.

Which is what I suggested with the usergroups.

Exactly