Project LightSpeed: Rewriting the Messenger codebase for a faster, smaller, and simpler messaging app

This post details Project LightSpeed, a massive undertaking to rewrite the Messenger iOS codebase from scratch. It highlights the achievement of making the app twice as fast and one-fourth the size by reducing core code by 84%. Key technical contributions include leveraging native OS features for rendering and threading, using dynamic UI templates powered by SQLite for code reuse, and implementing a server broker for efficient communication. This represents a significant architectural shift to improve performance, reduce complexity, and ensure long-term scalability for Messenger.