The uphill climb of making diff lines performant

GitHub has optimized its pull request review experience, particularly for large-scale requests, by implementing a new React-based interface for the "Files changed" tab. This overhaul aims to address performance issues such as interaction latency and high memory consumption, which were problematic in extremely large pull requests. The update focused on strategies like simplifying the React component tree, reducing DOM nodes, employing window virtualization, and using more efficient data access patterns. These changes have significantly improved core performance metrics, reducing JavaScript heap usage, DOM elements, and Interaction to Next Paint (INP) scores, resulting in a faster and more responsive user interface. These targeted optimizations, including reducing unnecessary React re-renders and enhancing state management, have made GitHub's UI feel more efficient and ready to handle the demands of large pull requests, demonstrating that even small, incremental changes can yield substantial improvements.

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