LESSON 1.2
Core Web Vitals in a React app
Learn key techniques and workflows in React Performance Engineering.
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Overview
Lab numbers on your laptop are not what users experience. Vitals give you a field measure of loading, responsiveness, and visual stability.
In this lesson you will:
- Interpret LCP, INP, and CLS in practical terms
- Separate lab data from field data
- Attribute a poor score to a specific element or interaction
Pro Tip
A good score on your machine means very little. Look at the field data from real devices.