Just like we had a discussion on the meaning of seamless, we can now have one on the meaning of fast.
I don't think "no hangover from bass distortion to make them sound "slow" " is fast, because then any DRCed system is fast. Well, as a matter of fact, Marty's spectral+pipedreams+JL Gothams+DRC is still the fastest system I heard, causing realism through macro impact, speed, and jumps. Trios with bass horns are darn fast too. For me micro fast is how each not continuously and swiftly follows the other note, creating micro impact. Macro fast is speed slams and jumps and bass thumps. Stats and ribbons move pretty fast. With cones, I can hear drivers taking their own time, especially in the midbass and bass