php - Severe High Memory Usage (Relative)

I am getting a Severe High Memory Usage (Relative) message from Zend Event monitor on a 2 line script which is literally:

<?php
 header('Location: https://www.website.com/directory/');
Copy code

The amount of memory being used is around 720kb when the error is reported for that page.

Any ideas of things to look into? I am at a loss as to why it could be so high for script like that.