… the technology at all regressed performance on either platform, it would be a blocker to adoption. We knew that React Native was not specifically built for high performance on scroll views. This was especially concerning since performance is critical for Pinterest, especially for our iconic image grids. In 2016, we rearchitected our iOS app to use asynchronous UI rendering in order to achieve high responsiveness and scroll smoothness. It was unlikely that React Native would beat our existing well-tuned system. Building in React Native makes the most sense for us on screens that don’t have highly-optimized performance requirements.