Edit your config.php file and add define('MDL_PERF_TEST', true); Login as admin You SHOULD be redirected to the front page as usual Go to a course and open a forum (add a new one if you don't have any) Add a new discussion You SHOULD see a text with all the performance info Go to the course main page click on an activity chooser to add an activity and fill the required form fields (don't click save) Edit lib/weblib.php and comment the following lines: @header($_SERVER ['SERVER_PROTOCOL'] . ' 303 See Other'); @header('Location: '.$url); Now click Save and return to course You SHOULD see a text with all the performance info