Analytics app

David Vacca describes how Facebook uses React Native in both new and existing apps, including Marketplace, and outlines work to improve its performance. He explains the current architecture: JavaScript, shadow, and main threads communicate asynchronously through a bridge, which can cause delays such as layout shifts when React Native content is embedded in native screens. The proposed refactor makes the React shadow tree immutable and thread-safe, rebuilds key UI components in C++, and updates the bridge to support prioritized synchronous and asynchronous calls. These changes are intended to improve responsiveness and integration with native interfaces while preserving compatibility for existing apps.