Could Cache'ing be your issue?
 
I'm a Drupal novice - so this is just a quick thought from the peanut gallery.
 
Have you looked at your Cache settings. The Apress book says Drupal defaults this to on, but I've noticed Caching disabled in all of our installs.
 
Let me know if this turns out to the issue.
 
Cozzi
-----Original Message-----
From: Laura Scott
Sent: Thursday, August 17, 2006 9:16 PM
To: support@drupal.org
 
We've run into problems with sites running on Site5, where they
claimed Drupal was using too much server resources, even with
virtually no traffic. However, others have been running sites on
Site5 with no problem so our experience does not seem to have been
typical.