Request: add explanation on how to interpret async code

[MidasLamb]

Running async code will "muddy" the code with a lot thing related to the async code (e.g. futures, pinning, polling,...) so it might not be as obvious as non-async code to where you should start looking to improve.

An explanation about how to go about this would be very helpful, as more and more thing move to async.

[fluidvanadium]

perhaps there's a way to name workers? for example i have some tokio workers all called zc-rayon-n and i cant identify them