The answer
Code splitting routes with React.lazy. Users only download the code for the page they visit, so the initial bundle stays small and the first load improves significantly, especially on slow networks.
How to Reduce Bundle Size in a Large React App
What is the biggest React bundle size win?
More FAQs in How to Reduce Bundle Size in a Large React App
Analyze with a bundle analyzer, code split routes with React.lazy, replace heavy libraries with lighter alternatives, tree-shake unused exports, remove unused dependencies, lazy load rare heavy widgets, and optimize images.
Use a bundle analyzer. It shows every dependency and its size, so you can find heavy libraries, accidentally shared chunks, and unused code. Never guess; the analyzer shows exactly what users download.
Look for lighter alternatives. date-fns is tree-shakable while moment is huge; lodash has per-method imports while the full bundle is heavy. Choose the lighter option and import only what you use.
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