Looking at the data, it appears that the performance drops are related to the StackContext feature. This feature is a convenience and not about doing things cor

Looking at the data, it appears that the performance drops are related to the StackContext feature. This feature is a convenience and not about doing things correctly to work in the real world. Because the very earliest versions of Tornado were used by real websites, it looks like the code that did 8 jillion requests per second worked well enough in the real world.