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Google’s Core Web Vitals are the three performance metrics that determine whether your site provides a good page experience. In 2026, they’re a confirmed ranking signal — and the gap between sites with good vitals and those without continues to widen in search results.
The Three Core Web Vitals
LCP — Largest Contentful Paint
Measures loading performance: how quickly the largest content element (image, heading, text block) becomes visible.
For more on this topic, see our guide on page experience optimization seo.
- Good: Under 2.5 seconds
- Needs improvement: 2.5-4.0 seconds
- Poor: Over 4.0 seconds
INP — Interaction to Next Paint
Measures interactivity: how quickly the page responds to user interactions (clicks, taps, key presses). Replaced FID in March 2024.
- Good: Under 200 milliseconds
- Needs improvement: 200-500 milliseconds
- Poor: Over 500 milliseconds
CLS — Cumulative Layout Shift
Measures visual stability: how much the page layout shifts unexpectedly during loading.
- Good: Under 0.1
- Needs improvement: 0.1-0.25
- Poor: Over 0.25
Fixing LCP Issues
- Optimize and compress hero images (use WebP/AVIF format)
- Implement lazy loading for below-the-fold images
- Use a CDN to reduce server response time
- Preload critical resources (fonts, hero images)
- Minimize render-blocking CSS and JavaScript
Fixing INP Issues
- Minimize JavaScript execution time during interactions
- Break up long tasks into smaller chunks (under 50ms)
- Use web workers for heavy computations
- Avoid layout recalculations during user interactions
- Defer non-critical JavaScript
Fixing CLS Issues
- Set explicit width and height for all images and videos
- Reserve space for ad slots before they load
- Avoid injecting content above existing content after load
- Use CSS contain for dynamic content areas
- Load web fonts with font-display: swap and fallback sizing
Content-Specific Web Vitals Tips
For content-heavy sites publishing at scale, these patterns are most common:
- Large hero images: Templates with oversized featured images are the #1 LCP killer. Resize to exactly the display dimensions, compress to WebP, and preload.
- Ad injection: Third-party ad scripts cause both CLS and INP issues. Use reserved space and async loading.
- Lazy-loaded above-fold content: Lazy loading slows LCP for content that’s immediately visible. Only lazy-load below-the-fold assets.
Core Web Vitals are the technical foundation that enables your content strategy to reach its full ranking potential. A technically fast, stable site lets Google focus on evaluating your content quality rather than penalizing poor page experience.
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