Even at large airports like Tapei, Beijing, Incheon, Narita etc that have low vis procedures, low vis taxi routes and 'all singing all dancing' ground radar things are incredibly slow. Only one aircraft allowed in certain zones at certain times, max 10kts taxi speed (for most airlines), all preflight activities completed before taxi, mandatory reporting points etc etc.
When you line up, all lights off for rwy assessment, static toga take-off......plus landing aircraft have to land and rollout to the end of the rwy.....all these things take time.....and cause horrendous delays......and this is at airports with well established low vis procedures........I could only imagine at BNE with 'gnd radar' for advisory purposes and no designated low vis taxi routes that it would be very slow going indeed!!!!!!