Beware! Async modes will not speed up your app, they are aimed at improving concurrency. Do not expect that enabling some of the modes will work flawlessly, asynchronous/evented/non-blocking systems require app cooperation, so if your app is developed without taking specific async engine rules into consideration, you are doing it wrong. Do not trust people suggesting you to blindly use async/evented/non-blocking systems!
https://uwsgi-docs.readthedocs.io/en/latest/Async.html