Being one of the fastest frameworks is one thing, but being one of the fastest in real world circumstances is another.
It not only saves your server CPU cycles and your users time, the carefully engineered KISS API will also save you time.
Europa effortlessly integrates with any framework or library because it is functionally coherent, loosely coupled and follows widely accepted standards.
Every bit of code is written with extensibility, maintainability, portability and ease of use in mind by making liberal use of namespaces, interfaces and abstract classes.
The code is wrought from the hands of talented, passionate developers that are constantly striving to write better code.
Europa does not do everything, but is meant to do what it does effectively and utilize other awesome tools like Twig, Doctrine and Zend for what they do well.