After PHP 5.3 was branched (for making place for ā€“ among other new stuff ā€“ namespaces), it was finally time to put my XSLT profiling addition into the official PHP sources. From now on, if you check out the PHP_5_3 (or 6) sources, you'll be able to profile your XSLT transformations. The patch for PHP 5.2 is still available here.