What Happens During Rendering?
When React renders a component, it calculates what the UI should look like for the current props and state. React then updates the browser DOM where necessary.
A re-render is not automatically a problem. Modern React applications can perform many renders efficiently.
How to Reduce Unnecessary Work
- Keep state close to where it is needed.
- Avoid storing values that can be calculated from existing state.
- Use stable keys for lists.
- Split very large components when that improves clarity.
- Measure performance before optimizing.
Profiling First
Use browser performance tools and React profiling tools to identify real bottlenecks instead of guessing which component is slow.
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