I've realised that my Percona DB which has several InnoDB tables doesn't actually have InnoDB buffer pool running as it wasn't specified in the my.cnf. I had a buffer pool size specified of 256MB, ...
I own a wordpress installation, and Updated to 3.4.1. After the upgrade, I got a very strange slowdown to my wordpress. After all, I used the define('SAVEQUERIES', true); in my wp-config.php with ...