A cartoon guide to performance in React
summary
Walks through React’s render algorithm by building a small list UI and exercising clicks so the virtual DOM batching behavior is visible, demonstrates a fruits-reversal example that shows how keys for stable identity let React reorder nodes instead of recreating them, measures wasted work with React perf tools and shows how shouldComponentUpdate with immutability uses cheap equality checks to skip renders, and shows a practical pattern to reduce sibling and parent updates by using connect lower to limit updates while noting the algorithm evolves.
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chapters (11)
- 0:00Introduction
- 3:40The Main Thread
- 8:00Virtual DOM
- 14:30Onclick handler
- 18:08Reduce reflows
- 19:01Children
- 19:21Comparison
- 20:38Why
- 21:40Should Component Update
- 22:30Should Component Update Bug
- 27:00Conclusion
