From ATC: Not sure if aircrew are aware of the impact of not taxying into the line up position expeditiously and then rolling when take-off clearance is issued.
Use of
"Behind the landing/departing Airbus/Boeing line up and wait behind" (which is used just about everywhere else on the planet) as the standard clearance would significantly assist pilots in expediting their line up. It enables us to anticipate when we need to be moving rather than being cleared and then get moving. The standard line up clearance in HK brings every one to a halt and no one (except the controller) at any of the 3 departure holding points knows who is next for departure. As at other international airports use of this line up clearance would negate most of your issues with traffic flow on to the runway and is rarely heard here.
The next area to assist is to accelerate consistently after airborne
The best way to achieve this would be to get rid of the 220/230 kt speed restrictions on departure from HK and make them 250 kts.
The aircraft takeoff acceleration profile is programmed into the FMC/FMGC and would be standard for everyone. The only way it would vary would be based on aircraft weight which would affect climb to 1'500 ft and accel profiles after this. When heavy the 220/230 kt speed restrictions affect our clean up profile and we are sometimes/mostly prevented from final flap retraction until they are lifted. Consequently we are unable to even fly the 220/230 kt as we are wedged between a flap min/max overspeed and trying to prevent an overspeed event.