Odd performance problem

Hello, While debugging a script that ran too slowly I came across something that I can't explain. It is inactive code that when removed doubles the run time of the script. Specifically, the issue is a switch statement, where one of the cases is never reached. If I remove the case from the code, the run time of the script goes from 6 seconds to 12 seconds. To see this problem in action, you can download the problematic script here: http://sebrechts.net/files/2008/phpperfissue.zip Anyone have any ideas on how this is even possible? I'd like to improve the run time of the script, but if every part of code that I take out makes it run longer ... Thanks