It’s thread drift but I suppose in some way pertinent to the subject as there isn’t any new information at the moment.
I’ve found, as a general observation, that to lose energy from the airframe you need to either fly it as fast as you can (highest parasitic drag plus brakes are most effective) or as slow as you can (highest lift-induced drag). Somewhere “in the middle” is where the aircraft is at its most efficient.
Depending on the distance to run, it’s possible to use an amalgam of both techniques: dive off the height at the top end of the speed range while you’re well away from the ground then slow down to fully configured, which gives the best gradient without excessive rates of descent and allows time for monitoring the progress of the approach. On the types I’ve flown, 700-1,000’ per mile is achievable without busting SOPs, once in the landing configuration and in normal conditions.