There exist a few forms of shorthand, the two popular ones are Pitman and Teeline. The former is notable for requiring different stroke pressure (hard/soft) and has ‘decoration’ around the outlines whereas teeline shorthand appears far more flowing and economical.
Fast teeliners hit speeds of 150wpm. That’s about two thirds the average speed people read, and about twice as fast as most people can type. So, seriously fast. Based on standard recommendation of 30mins/day, most individuals can reach 70wpm writing speed with a couple of months practice .