"Performs well" has no concrete meaning. It almost always requires a second question for clarification, e.g. "What does good performance specifically mean here?

"Performs well" has no concrete meaning. It almost always requires a second question for clarification, e.g. "What does good performance specifically mean here?" Or "performs well compared to what?" Scientist, doctors, lawyers, and other engineering disciplines use precise words. Software engineers should too. As more and more people use "performant" fewer and fewer people will understand what good performance actually means. I wouldn't be surprised if this encourages a culture of wasteful premature optimization.