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What are Core Web Vitals and how to improve them?

 Core Web Vitals are a set of metrics introduced by Google to measure a website’s user experience, specifically focusing on aspects like load speed, interactivity, and visual stability. These metrics are now important ranking factors, so understanding them is crucial for any SEO analyst.

Core Web Vitals


1. Largest Contentful Paint (LCP)

Definition: LCP measures the time it takes for the largest visible element (like an image, video, or large block of text) to load on the screen.

Ideal Score: A good LCP score is under 2.5 seconds. If it takes longer, it can frustrate users and increase the likelihood of them leaving the page.

Common Causes of Poor LCP:

Slow Server Response Times: If the server is slow to respond, everything else slows down. Use a CDN (Content Delivery Network) and optimize server response times.

Render-Blocking Resources: CSS, JavaScript, and fonts can slow down page rendering. Minimizing and deferring non-critical resources helps speed up LCP.

Large Images or Videos: Large media files take longer to load. Compress images, use modern formats (like WebP), and implement lazy loading where possible.

Tools for Measuring LCP:

  • Google PageSpeed Insights
  • Chrome DevTools
  • Web Vitals Extension for Chrome

2. First Input Delay (FID)

Definition: FID measures the time from when a user first interacts with a page (e.g., clicks a link, taps a button) to when the browser begins processing that interaction.
Ideal Score: A good FID score is less than 100 milliseconds. A slow FID score can cause frustration, especially on interactive pages like forms or shopping carts.

Common Causes of Poor FID:

Heavy JavaScript Execution: If the browser is busy processing JavaScript, it can’t respond to user interactions. Reducing JavaScript and using asynchronous loading can help.

Long Tasks: Breaking down long JavaScript tasks into smaller chunks prevents the browser from getting stuck.

Third-Party Scripts: External scripts (like ads or social media plugins) can delay interactivity. Minimizing these can improve FID.

Tools for Measuring FID:

  • Google PageSpeed Insights
  • Chrome DevTools (Performance tab)
  • Lighthouse in Chrome DevTools

3. Cumulative Layout Shift (CLS)

Definition: CLS measures the visual stability of a webpage by tracking unexpected layout shifts, such as when elements move around after the page has loaded.

Ideal Score: A good CLS score is less than 0.1. Higher scores indicate a page that feels unstable, where elements like buttons or images jump around, often causing users to misclick or lose their place on the page.


 

Common Causes of Poor CLS:

Images or Ads Without Dimensions: When images or ads don’t have specified height and width, the browser doesn’t know how much space to allocate, causing shifts as they load.

Dynamically Injected Content: Content that loads after the initial page render can push other content around.

Web Fonts: Sometimes fonts load in stages (flash of unstyled text, flash of styled text), which can cause layout shifts.

Tools for Measuring CLS:

  • Google PageSpeed Insights
  • Web Vitals Extension for Chrome
  • Chrome DevTools (Performance tab)

How to Check Core Web Vitals for a Website

Google PageSpeed Insights: Run a URL through PageSpeed Insights to see specific Core Web Vitals scores for both mobile and desktop.
Google Search Console (GSC): GSC’s Core Web Vitals report provides insights across the whole site and helps identify which URLs are failing Core Web Vitals.

Chrome DevTools: Useful for debugging issues with a real-time view of how the page loads, including paint and layout shift markers.


Summary of Core Web Vitals Benchmarks

Here’s a quick reference for what Google considers a “good” score for each metric:

LCP: ≤ 2.5 seconds

FID: ≤ 100 milliseconds

CLS: ≤ 0.1

Mastering Core Web Vitals means not only understanding each metric but also knowing how to diagnose and address the issues that impact them. Practicing with real websites and using developer tools like PageSpeed Insights and Chrome DevTools will give you a solid foundation for handling these metrics in a professional SEO role.

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