George Lucas has talked about this specific line and measurement in interviews. The idea was that if you have a better nav computer you could get places faster by planting the shortest route. One way to think of it with the hyperspace is as if all ships are held at a more-or-less constant speed in hyperspace, and thus to get there faster than someone the only real was was to find a shorter route through hyperspace. Better nav computers and sensors could plot better courses through asteroid fields and closer to sun’s without having issues, whereas poorer computers would plot really safe routes that take longer.
https://youtube.com/shorts/VOys-f1HaIc
https://youtube.com/shorts/f5bftwl0h_I
Here are two quick clips. If you spend any time searching into this you will very quickly find lots more. The original comes from the making of documentary done in the 90’s