J security line at T4 is 5-10 minutes. Not too bad. No idea what the ontime stats are for QF107 but it has always been over an hour late whenever I have flown it. It must be closer to on-time most of the time or QF would reschedule it (too disruptive for LAX T4 operations as they are really short on wide-body gates, and only 2 are 744 capable.