Once a student asked me: is this script called ‘italic’ because it is from Italy? To be honest, I never thought about it that way, but he was right, since its origin lies in Italy.
Italic script is also known as cursive script. Cursive comes from from Medieval Latin cursivus and means ‘running’. This explains it all. It can be fast, because you can make upstrokes and downstrokes, where in roman script you can only make downstrokes. This speeds up writing.
Speed in handwriting is achieved through personal skill. Rhythm, essential for speed, is inherent in many letters of the alphabet, making the patterns flow naturally. The possible calligraphic graces of italic script seem endless.