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PageSpeed Analyzer

Core Web Vitals optimization checklist and PageSpeed Insights integration

PageSpeed Insights Analysis

Get detailed analysis results from Google PageSpeed Insights

Core Web Vitals Overview

LCP (Largest Contentful Paint)

Target: under 2.5s

Measures loading performance. The time it takes for the main content to become visible to users.

INP (Interaction to Next Paint)

Target: under 200ms

Measures interactivity. The time from user interaction to visual feedback.

CLS (Cumulative Layout Shift)

Target: under 0.1

Measures visual stability. Unexpected layout shifts during page load.

Optimization Checklist

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LCP Optimization (Loading)

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INP Optimization (Interactivity)

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CLS Optimization (Visual Stability)

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General Optimization

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PageSpeed Optimization Guide

Improve search rankings and user experience with Core Web Vitals

What are Core Web Vitals?

Core Web Vitals are Google's key metrics for web page quality, measuring loading (LCP), interactivity (INP), and visual stability (CLS). Since 2021, they've been a Google search ranking factor, making them essential for SEO.

How to Use

  1. Enter URL and open PageSpeed Insights
  2. Review real user data and lab simulation results
  3. Follow the checklist to optimize your site
  4. Re-measure after changes to verify improvement

Optimization Tips

  • LCP is usually the largest image or text block
  • Split long JavaScript tasks to improve INP
  • Specify dimensions for all media elements to avoid CLS

Measurement Tools

Use Chrome DevTools Lighthouse, PageSpeed Insights, and Search Console Core Web Vitals report to measure performance.

Frequently Asked Questions

How important are Core Web Vitals for SEO?

Core Web Vitals are one of Google's ranking factors. Content relevance remains most important, but page experience matters. They become a differentiator when competing pages have similar quality.

What's the difference between field and lab data?

Field data (real user data) reflects actual Chrome user experiences. Lab data (simulation) is testing in controlled conditions. Both are important, but field data is used for search rankings.

Which score matters more, mobile or desktop?

Mobile is more important since Google uses mobile-first indexing. However, optimize for both. Mobile users are more numerous and have varied network/device conditions.

Where should I start with a low score?

Check the 'Opportunities' section in PageSpeed Insights. Fix items with the highest time savings first. Typically: 1) Image optimization, 2) Remove unused code, 3) Eliminate render-blocking resources, 4) Implement caching.

How to handle third-party scripts lowering my score?

Third-party scripts (ads, analytics, chat) are common performance issues. Solutions: 1) Review necessity, 2) Load with defer/async, 3) Load after user interaction, 4) Use facade pattern. Minimize impact if removal isn't possible.

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