I don't see any errors or an increased cpu/memory load.
First of all, make sure that display_errors in your php.ini file is set to On. I believe that the distribution file that comes with PHP has it set to Off by default. Once it's set to On, see if you can get it to generate an error and post it.
You may also use ini_set() to set display_errors to "1" to turn them on for a particular page only.
-Ben
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