LESSON 3.2
Deferring expensive values
Learn key techniques and workflows in React Performance Engineering.
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Overview
A deferred value lags behind the real one on purpose, letting the urgent render finish first with the previous result.
In this lesson you will:
- Defer a value that drives expensive rendering
- Choose between deferring a value and wrapping an update
- Communicate staleness to the user while it catches up
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.