Como as técnicas de Naoya e Naobito os tornam mais rápidos?

I was researching the technique and became very confused about how it works and how it makes its users faster. In my research, I discovered that someone capable of performing 24 movements/steps within one second should have a speed of around 86,4 km/h. But that's extremely slow by jujutsu sorcerer standards. I know there's that issue of increased speed depending on how often the technique is activated continuously. But I'm almost certain that the extreme speed that Naoya and Naobito possess doesn't come solely from that.