How to make multi-threaded execution of commands?

Question

API

Good day. How to make the execution of bot commands in such a way that they are executed without delay? Let's say 20,000 users enter a command, and the response for them was instant.

Answer 1

Absolutely all actions that require time to complete must be asynchronous, run in separate threads. At a minimum, this is working with a database, network requests, and even files.
Easier - you need the handler itself to work not in one thread, but in several or even processes / servers, i.e. run several handlers, and the central one, through which the connection goes, should only redirect requests.