I've found that having xf_session as InnoDB dramatically adds to the page generation time. On a powerful test server, with optimised my.ini settings and nothing else running (other that me hitting that page), the forum index page generation times are as follows: xf_session = MyISAM = 0.03s xf_session = Innodb = 0.10 - .015s That's over a 3 fold increase from this one query: UPDATE `xf_session` SET `expiry_date` = ? WHERE (session_id = '2cb236cf10c72722230ac458f575e89e') Is there anything I can do to speed things up, other than switching to MyISAM? I'd like to avoid doing so, as if the table is marked as crashed then it would bring the forum down (and it'll happen at some point!).