Initial plans for the Mozilla grant also included making DRF an official Django project, but details are sparse.
Now if you had mentioned heavy concurrency I might actually take your comment a bit more seriously. Then the answer is don't use Django or python, use golang or C/Rust.
Vague rebuke: In my experience, Django actually does very well compared to a lot of other solutions. So there.
I particularly don't understand the "complex front-end" part. What about django's templating system hinders implementing a rich javascript based UI?
I've been quite happy using the templating system to deliver data to the front end and then using whatever js libs / frameworks I've needed to display the data to the user....
Heroku has a short tutorial building a chat app at https://blog.heroku.com/in_deep_with_django_channels_the_fut...
You can find more example projects at https://github.com/andrewgodwin/channels-examples