The slides (<a href="http://talks.php.net/show/dojo/1" rel="nofollow">http://talks.php.net/show/dojo/1</a>) seem good as a quick overview of the talk. The take home messages generally being: make sure you know where your application is spending its time using strace, and to track superfluous overhead (such as configurable fallbacks that you can hardcode in a deployed application). Also: HipHop is not a magic bullet. Without heavily computational application code it gives only marginal improvements over PHP with APC, at least in these tests.