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Learn how to measure performance when migrating to React Native in brownfield projects through this 12-minute conference talk from the React Universe x Zalando Meetup in Berlin. Discover Zalando's approach to incrementally introducing React Native without rebuilding their entire app from scratch, where the UI remained consistent but the rendering model shifted from a single GraphQL response to a streaming, module-based architecture powered by an internal Rendering Engine. Explore why traditional screen load metrics became insufficient for this new architecture and understand how Zalando developed a "Meaningful Render" metric inspired by Largest Contentful Paint (LCP). Master the implementation details including how modules declare themselves as meaningful, the role of onLayout callbacks, custom performance marks, and OpenTelemetry spans in powering the measurement system. Gain insights from real-world production experiences during gradual rollouts and learn practical strategies for performance observability in large-scale brownfield React Native migrations.
