Core Web Vitals are Google's official metrics for user experience. Google uses them as one of many signals when it ranks pages.
1. Largest Contentful Paint (LCP)
Goal: < 2.5s. This measures load speed. Fix: Preload your hero image, use NextGen formats (WebP), and implement server-side caching.
2. Interaction to Next Paint (INP)
Goal: < 200ms. This measures responsiveness. Fix: Break up long JavaScript tasks and defer non-essential scripts (like chat widgets) until after load.
3. Cumulative Layout Shift (CLS)
Goal: < 0.1. This measures visual stability. Fix: Always set explicit width/height attributes on images and reserve space for ads.
For a broader view of site health, check our traffic drop checklist.
Analyze your Vitals: Zyro's Watchdog checks how fast your pages load on real shoppers' phones and emails you when there is a problem.