RhymeZone: performant definitions

Definitions of performant:

adjective: Of or relating to performance.
adjective: Capable of or characterized by a high or excellent level of performance or efficiency.
adjective: (computing) Characterized by a level of performance or efficiency that is adequate for or exceeds the expectations of end users.
noun: (obsolete, rare) Someone who performs something, such as a ritual; a performer.

(Definitions from Wiktionary)