[Lunrtick]

The author of SQLAlchemy (which recently released great async support) wrote a great post about how async can actually lead to a small decrease in performance compared to the older threading model, at least for db related functions in a web backend context. [1]

For websockets or lots of network calls, you can't really beat async though.

[1] https://techspot.zzzeek.org/2015/02/15/asynchronous-python-a...