I noticed I’m getting quite a bit of this in MySQL logs:
/home7/sonyrumo/tmp/mysql_slow_queries/20120217-15.log
# Fri Feb 17 15:58:27 2012
# Query_time: 3.432624 Lock_time: 0.001020 Rows_sent: 16 Rows_examined: 80
use sonyrumo_wrd1;
SELECT t.*, tt.*, tr.object_id FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN (‘category’, ‘post_tag’, ‘post_format’, ‘author’) AND tr.object_id IN (3009) ORDER BY t.name ASC
With query times over 2 seconds. Could this be the cause?