One way to hold presto: something going past so fast that the middle of it never reaches your eyes. On a page of music that speed is an instruction — take these notes at a run — and the fast movement itself ends up wearing the name. Push the same speed a little further and you stop being able to follow it at all: the hand moves, the coin is somewhere else, and the only honest report is that it happened. That is the shout at the end of a trick, and it is also what you say when a machine does in one second what you expected to take ten.
From the word’s history
English took presto straight from Italian presto, meaning 'quickly'. Both branches in English keep that one word: the musical instruction is the plain meaning, and the magician's call is the same speed pushed to the point where it looks impossible.
英文的 presto 直接借自義大利文 presto，意思就是「快」。英文這兩條線都還握著這個字：樂譜上的用法是它字面的意思，而魔術師喊的那一聲，是同樣的快被推到看起來不可能的地步。
Wiktionary, "presto"
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