Twisted (https://en.wikipedia.org/wiki/Twisted_(software)) has been around for longer than Node has existed. It is very effective at networking and async I/O use cases that are a sweet spot for Node, but the programming model differed from mainstream Python. It fell into a niche as many developers followed the WSGI-based approach for web development. With asyncio becoming available in Python it is re-integrating into the mainstream of the Python community (https://asyncio.readthedocs.io/en/latest/twisted.html).

You've always emphasised performance as a feature when building products. It feels like many other developers and product managers pay lip service to this. Has your thinking changed over the years, and does this remain an opportunity for almost any product?