Bundle, Network & Waterfall Optimization
A React application can feel slow before React even renders. Large JavaScript bundles, duplicate dependencies, uncompressed assets, font loading, API waterfalls, and render-blocking resources all matter.
Prefer parallel data fetching when dependencies allow it. Preload or prefetch intentionally rather than indiscriminately. Compress assets, cache immutable files, and remove unused dependencies.
Measure using browser performance tools and real-user metrics rather than relying only on local development builds.
Key Takeaways
- Network waterfalls can dominate UI latency.
- Analyze production bundles rather than development output.
- Parallelize independent requests and cache appropriate resources.