Mod_php?

I've gone through the excellent Linode newbie guide to hosting a website (eventually I'm going to be migrating a fairly high traffic site to linode).

A quick question i can't find the answer to. If I've installed php as described in the guide, is that using PHP through DSO (or mod_php) - or is it PHP through CGI or suPHP etc.?

Currently I use DSO on my old host for speed (there are no other users on my account uploading scripts so I didn't think the security drawback was a problem in my case). I was just hoping to setup the same for this on Linode (we tried suPHP once and the world ground to a halt pretty quickly)