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c.1300, "carry into effect, fulfill, discharge," via Anglo-French performer, altered (by influence of Old French forme "form") from Old French parfornir "to do, carry out, finish, accomplish," from par- "completely" (see per-) + fornir "to provide" (see furnish).
Theatrical/musical sense is from c.1600. The verb was used with wider senses in Middle English than now, including "to make, construct; produce, bring about;" also "come true" (of dreams), and to performen muche time was "to live long." Related: Performed; performing.
To do a sex act; function sexually: She didn't love him, but liked the way he performed (1916+)