Does FixedUpdate work normally?

Question

C++ / C#

Why when I put an action, for example, GetKeyDown on FixedUpdate, it works for me 1 time out of 5? No matter how much you poke the button, nothing happens until the update passes, apparently, but everyone tells the physics to do it through it, since I can control the character if it has an imput lag? Maybe my update is too slow? Does he adjust at all?

Answer 1

FixedUpdate calculates the action every few seconds.
Update every frame...