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Exactly! @Scilly.Suffolk: Kelly's use of the term as a neutral-ish 3rd party seems to just mean 'performing well', or be comparative (as in 'x outperforms y').
But in IT it's more loaded: vaguely defensive when used by a 1st party as per @christianSpaceman, or vaguely critical when used by a second party:
We appreciate the work christianSpaceman's put in, and that it takes 20% less time to run, and has saved £1000 storage costs per month. But the fact is, we're still not feeling it's performant from our users point of view. Could he take some time to engage with them and find out where their pain points are?
I don't think anyone has posted the new classic IT term performant.
As in, 'is the application performant on this hardware?'
Means either 'very fast' or 'fast enough', depending on who you ask. Or maybe 'efficient'.
But rather than use such a specific term, or even a measure, performant adds a generous cloud of uncertainty.
It's ripe for use in the general business world.