Whereas you can learn to do fast printing. My writing speed improved later in life once I convinced myself to switch back over to print characters -- I can speed up the process without losing legibility. Also some people do a mixture of the two, which really is writing out ligatures for common character pairings. I don't really do that, and it seams everyone sort of figures out their own stile, but it would be nice if written ligatures were taught as an in-between style.
Edit: To see examples, do a search for "fast printing", I know there were several good posts on one of the fountain pen forums. The style I liked referenced "bookhand", and to get good/legible at it you start by practicing writing small circles (both clockwise and counter-clockwise) and small straight lines (horizontal, vertical, diagonal with various starting positions). This also helps with general technical drawing, things like writing circles and making them larger and smaller. And learning to draw a straight line across a page freehand will help with character alignment.