I tried nnn after I was dissatisfied with ranger's startup time.

nnn is much faster, but I was already used to ranger's keystrokes and I did not want to learn a new set of keystrokes.

Then learned about lf, a ranger clone written in go, which is much faster. That is what I use now.

It is possible that nnn is the fastest file manager out there.

You may also want to try Midnight commander, a timeless classic.