The term 'performed slowly' can be summarized by the word ADAGIO, which is a musical term meaning 'at a slow tempo'. It is often used to describe a piece of music that is meant to be played slowly and with great expression. ADAGIO is derived from the Italian phrase 'ad agio', which translates to 'at ease'. This term is commonly used in classical music, but can also be found in other genres such as jazz and pop.