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What are Core Web Vitals? Is it useful for the website?

  • Writer: Pallavi THakur
    Pallavi THakur
  • Aug 8
  • 3 min read

Core Web Vitals are a set of performance metrics introduced by Google to measure the real-world user experience of a website. They focus on aspects that affect user interaction, such as loading speed, interactivity, and visual stability. These metrics are essential for ensuring that a website is fast, responsive, and visually stable — all of which are crucial for providing a good user experience.

Core web vitals for website

What are Core Web Vitals?

Core Web Vitals are three specific metrics:

1. Largest Contentful Paint (LCP)

  • What it measures: Loading performance

  • Definition: The time it takes for the largest content element (e.g., image, video, block of text) in the viewport to become visible.

  • Good score: ≤ 2.5 seconds

2. First Input Delay (FID) (Being replaced by INP)

  • What it measures: Interactivity

  • Definition: The delay between a user's first interaction (like clicking a button) and the time when the browser responds to it.

  • Good score: ≤ 100 milliseconds

  • 🔄 Update: Google is transitioning from FID to INP (Interaction to Next Paint), which better measures responsiveness across all user interactions.

3. Cumulative Layout Shift (CLS)

  • What it measures: Visual stability

  • Definition: Measures unexpected layout shifts during page load. If elements move around while you're trying to read or click something, that’s a poor CLS.

  • Good score: ≤ 0.1


Why Optimize for Core Web Vitals?

1. Improves User Experience

  • Websites that load quickly, respond instantly, and maintain visual consistency keep users engaged.

  • A better user experience often leads to higher conversion rates, longer visit durations, and lower bounce rates.

2. Boosts SEO Rankings

  • Since June 2021, Google has included Core Web Vitals as part of its ranking algorithm (as part of the "Page Experience" update).

  • A site that performs well on Core Web Vitals may rank higher in search results, especially for competitive keywords.

3. Reduces Bounce Rate

  • Slow or unstable websites frustrate users, causing them to leave the site prematurely.

  • Optimizing for CWV helps retain visitors and encourages them to explore more pages.

4. Increases Conversions

  • Studies show that a delay of even one second can significantly reduce conversions.

  • A smoother, faster experience translates into more completed transactions, form submissions, or other goals.

5. Future-Proofing Your Site

  • Google continues to evolve its ranking signals to prioritize user experience. Focusing on Core Web Vitals now positions your site well for future updates.


Is Core Web Vitals Useful for Websites?

Absolutely — and here’s why:

Benefit Area

Impact

SEO

Higher rankings in search engine results

User Trust

Stable layouts and responsiveness boost credibility

Retention

Faster, smoother experiences keep users on the site

Revenue

Improved performance leads to higher conversion rates

Brand Image

A fast, responsive website enhances your brand perception

Tools to Measure and Optimize Core Web Vitals

Summary

Aspect

Explanation

Core Web Vitals

Google’s key metrics for evaluating web performance and user experience

Need for Optimization

Better user experience, SEO, conversions, and future-readiness

Usefulness

Essential for online success in a competitive digital environment

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