Do I need a fallback for every lazy component?
Yes. Every lazy component must be wrapped in a Suspense with a fallback. Without a fallback, React has nothing to show while the code loads, and you get an error instead of a loading state.
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More FAQs in Lazy Loading Components in React: Best Practices With Suspense
Most impactfully, route-level components. Users only download the code for the page they visit, which keeps the first load small. Avoid lazy loading tiny components that are used immediately, as that adds overhead without benefit.
Around routes or large independent sections, not around every tiny component. Too many boundaries add overhead; too few give a poor loading experience. Place them where a fallback makes sense to the user.
Wrap lazy components in an error boundary. If the network drops and a chunk fails to load, the error boundary shows a retry option instead of a blank screen, which is a much better user experience.
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