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 I think 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 by personal ability. Rhythm, an essential to speed, is inherent in many letters of the alphabet, and pattern comes simply and delightful. There seems no end to the possible calligraphic graces of italic.