Year class: A classification system for Android

This post introduces the 'year class' classification system for Android devices, which categorizes phones based on their hardware specifications (RAM, CPU cores, clock speed) to represent their historical high-end status. This system allows for more accurate performance analysis and targeted feature rollouts, such as shipping a better commenting UI to higher-class phones while optimizing for older models. It also influences News Feed ranking to avoid showing video stories on devices that cannot play them smoothly. The post also details the development of a 'connection quality' score, which measures network latency and image transfer rates to dynamically adjust app features like video autoplay and photo quality, independent of reported network types, to ensure graceful performance on various network conditions, including congested EDGE connections.