I made the hack only do the calcs if the person was an admin or mod.... (i.e. it doesn't just control the output of it) just in case there was server load to be saved it would save it.
No additional overhead comes from printing the debug info. Basically, it does a timestamp before and after the page is finished and increments a counter by one each to do_query is called. So, it does do a couple extra things, but extremely minor.
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