Multiple runway departures when RW03 & 06 are in use. Then usually single runway arrivals RW03.
Single runway departures when 21 is in use and multiple runway arrivals RW21 and 24.
Half the problem is the taxiways around the Qantas and common user domestic terminals atm. All it needs is a QH heavy to push back off its bay and if 21 is in use, everything behind them have to stop and wait for them to commence taxi. Hopefully the imminent relocation of the fire station will help and they can maybe build a parallel taxiway.