React.memo — Gossip, Source, Edge of Usefulness
summary
Examines how React.memo actually works by inspecting React source code, distinguishing React.memo from React.useMemo and explaining when memo helps or hurts performance. Covers the internal split between memo and simple memo, addresses claims that memo might become default component behavior, presents Dan Abramov’s techniques for improving performance without memo, and ends with a decision flowchart for when to use React.memo.
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chapters (9)
- 0:00Introduction
- 3:06What is React.memo
- 8:47React.memo source code
- 17:16Simple memoization
- 23:54Speed without memo
- 28:50Default memo behavior
- 39:29Usefulness benchmarks
- 45:49Practical React.memo
- 49:38Q&A
