Best/s web framework/s for high performance applications

I know that this is a vague question because an application performance depends on a lot of things, not just the web framework, depends more like on the whole implementation of the system.

And i know also that this is quite a subjective thing, that allows many probably good answers.

But... if you are a software enginner responsible for write a web application that is going to be used by millions and millions of users per day which framework/s would you choose and why?

Thanks for taking the time of reading this.