Phalcon
High performance, full-stack PHP framework delivered as a C extension
...Thanks to its low-level architecture and optimizations Phalcon provides the lowest overhead for MVC-based applications. Build single and multi-module applications with ease and pleasure. Using the file structure, scheme and patterns you already know. Phalcon is built upon a powerful yet easy to understand and use pattern called Dependency Injection. Initialize or define services once, and use them virtually anywhere throughout the application.