Core Web Vitals: The Foundation of Performance
Largest Contentful Paint (LCP)
LCP measures loading performance and should occur within 2.5 seconds of the page starting to load. Optimize by:
- Implementing lazy loading for below-fold content
- Implementing efficient caching strategies
- Optimizing server response time
- Using content delivery networks (CDNs)
- Minimizing critical rendering path resources
- Optimizing and compressing images
First Input Delay (FID)
FID measures interactivity and should be less than 100 milliseconds. Improve by:
- Using web workers for complex calculations
- Reducing JavaScript execution time
- Breaking up long tasks
- Optimizing third-party code impact
- Implementing browser caching
- Minimizing main thread work
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