A Talk About Optimization and Hares
summary
A JavaScript conference talk argues that React's useMemo and useCallback are unnecessary and often harm performance in the vast majority of cases, and presents evidence and reasoning to support that claim. The session also includes a demonstration or appearance involving a hare.
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chapters (20)
- 0:00Introduction
- 1:06Optimization matters
- 2:55Renders and timing
- 3:56useMemo and useCallback
- 5:43How they work
- 7:09Do they optimize
- 8:14Optimization example
- 11:52Why re-renders happen
- 13:19When they help
- 15:46Garbage collection
- 16:50User performance
- 18:15Memory savings
- 20:23Caching stability
- 21:30Optimize data
- 24:50Extra renders
- 26:32Reducing renders
- 28:40Justify optimization
- 30:26Right optimization
- 31:54Data over components
- 35:34Q&A
