If you're not an English speaker, it's even more aggravating when speakers of your language replace common words with English ones to sound more sophisticated/corporate. So instead of using the native word for "knowledge", they'd use "know-how". (Of course using more common words like "knowledge" or "skill" are not good enough, you need something that sounds more sophisticated to the foreign ear, like "know-how".)

performant is more loaded than 'fast'