SEO

What Is Core Web Vitals and How It Affects Your SEO Rankings

Buildifyer·October 19, 2025·9 min read

What Is Core Web Vitals?

Core Web Vitals are three metrics Google uses to evaluate the user experience of web pages. They directly affect SEO rankings.

LCP (Largest Contentful Paint)

Measures how fast the main content of the page loads. Target: under 2.5 seconds.

How to improve: optimize hero images, use a CDN, minimize CSS/JS.

INP (Interaction to Next Paint)

Measures how quickly the page responds to user actions. Target: under 200 ms.

How to improve: optimize JavaScript, avoid long tasks on the main thread.

CLS (Cumulative Layout Shift)

Measures visual stability — how much the layout shifts during loading. Target: under 0.1.

How to improve: set dimensions on images and videos, avoid dynamically injecting content.

How to Check?

Easiest way: open PageSpeed Insights and enter your site's URL. You'll get a score and specific recommendations.

Need help with optimization? Contact us.

Core Web Vitalsspeedtechnical SEOPageSpeed

Frequently asked questions

What is LCP (Largest Contentful Paint)?

LCP measures how fast the largest visible element on the page loads (usually the hero image or heading). A good value is under 2.5 seconds.

What is INP (Interaction to Next Paint)?

INP measures how quickly the page responds to user actions (clicks, taps). A good value is under 200 milliseconds.

What is CLS (Cumulative Layout Shift)?

CLS measures visual stability — how much content shifts during loading. A good value is under 0.1. Caused by images without dimensions and dynamically loaded content.

How to check Core Web Vitals on my site?

Use PageSpeed Insights (pagespeed.web.dev), Lighthouse in Chrome DevTools or Google Search Console → Core Web Vitals section.

Do Core Web Vitals affect SEO rankings?

Yes, Google confirmed that Core Web Vitals are a ranking factor. Sites with good values get an advantage, especially on mobile devices.

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