system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What aspect of space ship design makes it fast?

I was just wondering how the Millennium Falcon got so fast. Do you just need a big hyperdrive on a small hull? If that's true, how come no one designed lighter hulls to compete?
gpt
Actually, "speed" is largely a matter of navigation, not directly speed (although that plays a part).  Most of the Falcon's impressive run time comes from General Solo's personal modifications to the navigational computer.  For example, navigating around the black hole cluster surrounding the Kessel region requires a ponderous route of at least 21 Parsecs - however, Solo managed to chart a course that was only 9 Parsecs long.

When entering hyperdrive, navigation is crucial - gravitational fields surround stars at vast distances, and even the slightest gravitational pull has to be accounted for, since in hyperdrive the slightest change in direction can send you literally light-years off course.  And those mistakes can send you into further gravity fields (or even on a collision with a star or planet!), thus further altering your course, etc.  Navigation here is key - if you can successfully navigate this complex system, you can cut incredible length off your journey.