Tonight, I’ve tried to accelerate the site a bit by installing a php accelerator, eAccelerator.  Supposedly, this will cache some of the php behind the site, and make things a bit quicker, and hopefully less hard on the processor in the MacMini.

For reference, it installed as described when used as a php extension.  However, I did have to follow the note here to get Apache to initialize the module correctly on OS X.  Look for the PHP_VERSION note.
Dunno if it’ll make a difference, but hopefully it won’t make things any worse!