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Powered by Google PageSpeed Insights — results in ~5 seconds// analyze page speed & core web vitals in one click
Analyze any website's Core Web Vitals, performance score, and speed metrics instantly. Free, browser-based, powered by Google PageSpeed Insights.
Enter a URL to analyze
Powered by Google PageSpeed Insights — results in ~5 secondsPaste any full URL including https://
Select Mobile or Desktop analysis
Results appear in ~5–15 seconds
This tool uses the Google PageSpeed Insights API to measure real-world performance. It returns Lighthouse scores for Performance, Accessibility, Best Practices and SEO, plus Core Web Vitals like LCP, CLS, and FCP.
Results come directly from the Google PageSpeed Insights API (Lighthouse v10). They reflect real-world data from Chrome User Experience Report (CrUX) plus lab-simulated metrics, making them highly reliable for performance auditing.
Google considers 90–100 as Good (green), 50–89 as Needs Improvement (orange), and 0–49 as Poor (red). Aim for 90+ on desktop and 70+ on mobile for competitive websites.
Lighthouse simulates a mid-tier Android device on a 4G connection for mobile tests. This slower environment exposes performance bottlenecks that fast desktops hide. Mobile scores are typically 20–30 points lower.
Core Web Vitals are Google's user-experience metrics: LCP (Largest Contentful Paint) measures loading, FID/INP measures interactivity, and CLS (Cumulative Layout Shift) measures visual stability. They directly affect Google search rankings.
Completely free. This tool uses the public Google PageSpeed Insights API which is free to use without authentication for personal and professional usage.
Google's API actually loads and renders the page in a headless browser to collect real metrics. This process takes 5–20 seconds depending on the page size, server response, and current API load.
Website speed is no longer optional. Google uses Core Web Vitals as a direct ranking factor, and users abandon pages that take longer than 3 seconds to load. The JLV Page Speed Analyzer gives you instant access to professional-grade performance data — the same metrics Google uses to evaluate your site.
This tool analyzes four Lighthouse categories: Performance (how fast your page loads), Accessibility (how usable it is for everyone), Best Practices (security and modern web standards), and SEO (discoverability). Within Performance, Core Web Vitals include LCP, FCP, CLS, TBT, and TTFB.
Toggle between Mobile and Desktop to see how your site performs across devices. Google primarily uses mobile-first indexing, so mobile scores matter more for SEO. Desktop scores reflect how your site performs on high-speed connections with powerful hardware.
Common improvements include compressing images (use WebP format), eliminating render-blocking JavaScript, enabling browser caching, using a CDN, and minimizing unused CSS. The Opportunities section in results shows specific issues with estimated time savings.