The Mall of React, Part 2: Performance, Concurrency & Testing

The article discusses performance, concurrency, and testing issues in a large React application. To address these issues, the author recommends using the React DevTools Profiler to identify performance bottlenecks, implementing optimization techniques such as virtualization, debouncing, and throttling, and using concurrent features like useTransition and useDeferredValue. Additionally, the author emphasizes the importance of testing, including unit testing, mocking, and integration testing.