It's no wonder there are delays out of Perth. When the companies allow the accountants to write contracts that insist that 50 departures plan ETDs of 0545-0630 every Mon-Thurs what can we expect. Then lo and behold the clever dudes all want to arrive 0930 in the morning and you blame ATC! Give me a break.
Cluster scheduling is the problem not ATC. Whilst it is nothing new, there are just more of you and the same number of us as there was 15 years ago. The infrastructure at the airport also does not support the traffic growth experienced. Remember the Bomber carpark, well the only thing that has changed since then is the carpark! Same runways, same taxyways, same apron. Brilliant aerodrome when the Kittyhawks were flying! NOt so good now though.