Monarch man :
Recently I spoke with a tower controller who advised that on departures they can depart 5 x 777s in the time it takes to depart 2 x 380s
Nonsense statement as the separation between 2 777s is exactly the same as betwen 2 380s, so it will take exactly the same time to depart 5 777 and 5 380s. It is the weight category mixture, and especially a light after a 380 which is penalizing.
But if you apply the new RECAT separation ( like they do in CDG) together with better aircraft category grouping per runway , the Supers have minimal impact.