Just a reminder that memcached is awesome... I never bothered to configure it because I thought it wouldn't provide much benefit in a single server environment - I was very wrong, of course! Just activated it on a large WordPress + XenForo site (10+ million posts) which currently handles around 250k page views per day, hosted on a 16GB Linode (PM me for the link). Here's the NewRelic graph, with memcached activated at 7:45pm. Average total server response time dropped from 144ms to 101ms, a nearly 30% improvement. Thank you, Centminmod!