(Pulling from this discussion Dash callbacks are not async - handling multiple requests and callbacks in parallel)
From https://www.reddit.com/r/learnpython/comments/3fr2a8/windows_alternative_to_gunicorn_deploying_on/, some folks recommend Waitress. Here is usage:
$ waitress-serve --threads=6 my_app:server
Where my_app refers to the file named my_app.py (you can change this to the name of your app) and server refers to a variable in that file called server which should be initialized like:
server = app.server