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

Short summary

This is the second part of a React tutorial series using a shopping mall metaphor to explain performance optimization, concurrent features, and testing. It covers using the React DevTools Profiler to diagnose re-render bottlenecks, virtualization with react-window to avoid rendering thousands of DOM nodes, and debounce/throttle patterns to limit API calls. The article also previews upcoming sections on useTransition, useDeferredValue, and integration testing.

• •Use React DevTools Profiler to identify re-render bottlenecks before optimizing blindly
• •Apply virtualization with react-window to render only visible items instead of thousands of DOM nodes
• •Use debounce and throttle to prevent excessive API calls on rapid user input

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