Professional Web
Performance Analyzer
Get real Lighthouse scores, Core Web Vitals, and actionable insights using the same data Google uses for ranking.
Professional-Grade Performance Analysis
Same technology used by Google PageSpeed Insights, GTmetrix, and Lighthouse
Real Lighthouse Scores
Get authentic Performance, Accessibility, Best Practices, and SEO scores using Google's official API.
Real User Data (CrUX)
See how real Chrome users experience your site with 28-day field data from Chrome UX Report.
Actionable Opportunities
Get specific recommendations with estimated time savings for each optimization.
Visual Filmstrip
Watch your page load frame-by-frame to identify visual bottlenecks and render blocking.
Resource Breakdown
Detailed analysis of JavaScript, CSS, images, fonts, and all network requests.
Industry Benchmarks
Compare your performance against industry standards and top performers.
Understanding Core Web Vitals: A Complete Guide
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience. Since becoming a ranking factor in 2021, these metrics have become essential for any website looking to improve their search engine visibility and user satisfaction.
The Three Core Web Vitals Metrics
LCP (Largest Contentful Paint)
LCP measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading. This metric focuses on the largest content element visible in the viewport, typically an image or text block.
INP (Interaction to Next Paint)
INP measures interactivity by observing the latency of all click, tap, and keyboard interactions throughout the page lifecycle. Unlike FID which only measured the first interaction, INP considers all interactions, making it a more comprehensive responsiveness metric.
CLS (Cumulative Layout Shift)
CLS measures visual stability by quantifying how much unexpected layout shift occurs during the entire lifespan of the page. A low CLS score ensures that users don't experience frustrating jumps in content as the page loads.
Lab Data vs Field Data
This tool provides both Lab Data (Lighthouse simulated tests) and Field Data(real Chrome user data from CrUX). Lab data is great for debugging as it's reproducible and consistent. Field data shows actual user experience and is what Google uses for ranking decisions. For the most accurate picture, analyze both.
Why Our Data is Authentic
We use the official Google PageSpeed Insights API, which provides the exact same data that Google uses to evaluate websites for ranking. This means consistent, reliable results that accurately reflect your actual performance - not simulated or randomly generated metrics.
What Developers Say
“This is hands down the best Core Web Vitals tool I've used. The real Lighthouse scores and field data helped us identify exact issues. We reduced our LCP from 4.2s to 1.8s in just two weeks.”
“Finally, a tool that shows the same data Google uses! After implementing the recommendations, our organic traffic increased by 32%. The opportunities section saved us hours of debugging.”
“The filmstrip view and resource breakdown are game-changers. Being able to see exactly where time is spent during page load made optimization so much easier. Highly recommended!”
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