Database slowdown after update to 3.4.1

If you’ve got 60,000 records, try cleaning post/page revisions; these really accumulate and cause excessively long queries. I’ve seen database sizes drop 90% with huge increases in performance.

Run the query below in phpmyadmin or from the command line and then optimize:

DELETE a,b,c
FROM wp_posts a
LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id)
LEFT JOIN wp_postmeta c ON (a.ID = c.post_id)
WHERE a.post_type="revision"

Talk to your web host, too. Maybe MySQL or your CPU is being throttled down.

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