Debouncing is a known development tool for most non-immediate actions. It's related UI concept of locking individual UI elements is also well understood by many users (not by that technical name, but by "it's working on my action" kind of understanding).

> optimistically show the user a success result?

I don't particularly like React, but this a core feature of such JS frontend frameworks, optimistically "succeed" while async network and back-end work happens to give the illusion of speed: https://react.dev/blog/2024/04/25/react-19#new-hook-optimist...