The phrase "a matter of performance" is correct and usable in written English.
It can be used when discussing the importance or significance of performance in a particular context, such as work, sports, or any evaluative situation.
Example: "In this project, success is truly a matter of performance; we need to deliver our best work to meet the client's expectations."
Alternatives: "a question of performance" or "an issue of performance".
"This is a matter of performance," he said on Tuesday.
"It's all a matter of performance, and Willie knew this when he started," Wilpon said.
Stardom isn't a matter of performance; it's merely rooted in performance.
For me, love at least, love on the sublime level where I encountered it wasn't a matter of performance.
For me, love — at least, love on the sublime level where I encountered it — wasn't a matter of performance.
No less than movies, music isn't a matter of performance; it's a way of life that gets excerpted and distilled in performance.
One of the issues with the brakes, that they have less power than those in conventional cars, may just be a matter of differing performance and has not yet been deemed to breach safety regulations.
Design and operation of complex systems for combined cooling, heating and power generation (CCHP) are always a matter of matching performance and demand characteristics of a thermal system set to supply electrical, cooling and heating loads, according to specific usage demands.
Foreign Affairs Select Committee member John Baron called on the prime minister to clarify the British government's position on what was a matter of "seminal performance".
For surgical procedures, safety has traditionally been approached as a matter of individual performance; that is, complications represent failure by the surgeon, thus enhancing the risk of under-reporting (Wachter 2008).
The company was splendid in "Chopiniana" (the ballet that Westerners call "Les Sylphides"), as it has always been, but that piece is a matter of soloist performances; it has no one female lead.
