TFA has a benchmark comparing Midnight Commander to NNN.
Alternatively, could you please link to details about the comparison?
wenderen is indicating that the question you raise is addressed on the nnn Github page itself: https://github.com/jarun/nnn#performance
As explained in another comment, I'm interested in the experience of users of both programs. It's clear that nnn is not offered up as a specific alternative to mc, of course, but I consider mc a staple for file management in the terminal and I think that's not unreasonable of me, or controversial.
https://www.urbandictionary.com/define.php?term=tfa
Aside: a quick shortcut url for the free dictionary;
[F6]
tfd.com/word