Why memoize only where measured in React?
Because premature memoization adds overhead without benefit. Use the Profiler to find the real bottleneck, then memoize there. Optimizing without measuring is guesswork that often wastes effort.
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More FAQs in How to Optimize a React Project Before Production
Run the production build, analyze the bundle, code split routes with React.lazy, optimize and lazy-load images, memoize only where the Profiler shows a bottleneck, remove unused dependencies, and set up caching headers.
Because the dev bundle is large and slow, and optimizing it would mislead you. The production build is what users get, so optimize based on its output, not on the dev bundle.
Use a bundle analyzer. It shows every dependency and its size, so you can find heavy libraries to replace or remove, and accidentally shared chunks that could be split. Guessing wastes time.
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