I explain my problem : The function role_assign is really heavy. I made a development to enrol students automatically in their course spaces and groups (it's a synchronization with LDAP). When I call the function role_assign (or role_unassign it's the same problem), to enrol 186 students in a group and in a context of a course, it takes 213 secs! So, I tried to understand why before I post in this forum and I think I have a possible reason: I duplicated the function role_assign in a personalized function called role_assign_iut and I just commented the lines : /// Do some data validation if (empty($roleid)) { debugging('Role ID not provided'); return false; } if (empty($userid) && empty($groupid)) { debugging('Either userid or groupid must be provided'); return false; } if ($userid && !record_exists('user', 'id', $userid)) { debugging('User ID '.intval($userid).' does not exist!'); return false; } if ($groupid && !groups_group_exists($groupid)) { debugging('Group ID '.intval($groupid).' does not exist!'); return false; } if (!$context = get_context_instance_by_id($contextid)) { debugging('Context ID '.intval($contextid).' does not exist!'); return false; } if (($timestart and $timeend) and ($timestart > $timeend)) { debugging('The end time can not be earlier than the start time'); return false; } So now, the execution time takes only 2secs! I just commented these lines because I know my parameters are good, I checked them before the execution. My questions are : Why these params verifications takes so long? Why are these verifications here? Is it just to be sure the developers like me don't use bad params? Regards, MELIX Simon