[babysteps]

I chose my words carefully. Not wanting to get too technical. I was not insinuating that Drupal hadn't it's own caching.

Page runs on Drupal > Drupal uses database > Database connections were exhausted. I was suggesting caching up front to bypass calls to the database (not specifying a particular piece of caching software).

At the time I was looking at the page through a 3rd party cache. I didn't realise the page had inline comments, those would of course complicate the problem.