at around 3:40 on the top island, how do you unload units instantly. For the last 10000 drops I ahve done, I always see transport move into position, then hover for a few seconds, then release units.
Some people, like the better setons players, release the units right as the transport gets into position, it is all in one motion, no hover, and if the transport has a subsequent move order, it gets out right away.