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ran it on my staging server phpmyadmin, here was the results (15 total, Query took 1.6839 seconds.)
I accessed the feed through a feed reader and the errors showed in the error log, but not when I ran the sql query, feed reader took 2.003 seconds
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I tried cutting back on the amount it was showing in the feed, I dropped it to 10, then 5, and they were 1.9 and 1.7 seconds for the query, I then limited the feed to just topic names to see if that fixed it, and just the 10 topic names were above 2 seconds for the query
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interesting that a feed reader increases the queries (not sure why)??
there is nothing special about the feed, especially if only 5 items? way less complex a query than you forum front page... and getting several times an order of magnitude less than that myself...
may need Andy to jump in here, but when you do it on your staging server, can you have it do an explain? will give more info about what the query is trying to do and may offer insight...
also might be useful to see your keys for the sfgroup, sfforum and sftopic tables... make sure indexes look right... though if not, would expect the main forum view queries to be very poor then...
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here is the explain
| 1 | SIMPLE | rufus_sfgroups | ALL | PRIMARY | NULL | NULL | NULL | 3 | Using temporary; Using filesort |
| 1 | SIMPLE | rufus_sfforums | ref | PRIMARY,groupf_idx | groupf_idx | 8 | snapshot_kvr28.rufus_sfgroups.group_id | 5 | Using where |
| 1 | SIMPLE | rufus_sfposts | ref | topicp_idx,forump_idx | forump_idx | 8 | snapshot_kvr28.rufus_sfforums.forum_id | 1138 | |
| 1 | SIMPLE | rufus_sftopics | eq_ref | PRIMARY | PRIMARY | 8 | snapshot_kvr28.rufus_sfposts.topic_id | 1 | |
| 1 | SIMPLE | rufus_sfmembers | eq_ref | PRIMARY | PRIMARY | 8 | snapshot_kvr28.rufus_sfposts.user_id | 1 |
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a temp table and filesort, eh? seems bit overkill, but as I said, may need input from Andy...
are you suing MyISAM or InnoDB tables?
oh,and can you paste in your my.ini setup? be sure no passwords or other private info in what you post... 
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it's a mix of both, sf_posts are InnoDB, where would I find the my.ini? have I posted anything private so far that you have noticed? I thought I had edited everything out
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Mixture? How would the sfxxxx tables not all be the same?
my.ini will vary based on server os.. Usually /etc
There are some config options in the else for memory and things... Might be worth tweaking....
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dunno, all are Myisam except for sflinks, sfoptions, sfpostattachments, and sfposts, those are InnoDB, we use wp-engine, we had the issue with the sql query error with the search function when we first started using SP until yellow fixed the issue so it worked with the way wp-engine has the tables set up
I will hunt down the my.ini
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Have to wonder if the mixed table types are contributing to this... Seems odd, but perhaps okay...
On your test site, might be worth downloading are plugin (on download page) for converting tables to InnoDB and see if it matters...
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