performance

The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action.

“the performance of an undertaking or a duty”

That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; especially, an action of an elaborate or public character.

A live show or concert.

The amount of useful work accomplished estimated in terms of time needed, resources used, etc.

“Better performance means more work accomplished in shorter time and/or using fewer resources.”

The actual use of language in concrete situations by native speakers of a language, as opposed to the system of linguistic knowledge they possess (competence), cf. :w:linguistic performance.