Test your website performance with Google PageSpeed Insights. Get Core Web Vitals scores, detailed metrics, and actionable optimization tips.
Follow these proven optimization tips to improve your Core Web Vitals and page speed scores.
Use modern formats like WebP and AVIF. Compress images and use responsive srcset attributes to serve appropriately sized images for each device.
Remove unused code, split bundles, and defer non-critical scripts. Large JavaScript payloads are the top cause of slow Time to Interactive.
Use Gzip or Brotli compression for text-based assets. This can reduce transfer sizes by 60-80% and dramatically improve load times.
Use a CDN, optimize database queries, and implement server-side caching. Aim for a TTFB under 200ms for the best user experience.
Set explicit width and height on images and embeds. Reserve space for dynamic content to prevent Cumulative Layout Shift issues.
Set appropriate cache-control headers for static assets. Returning visitors will load your site significantly faster with proper caching.
Everything you need to know about page speed and Core Web Vitals.
A score of 90-100 is considered good (green), 50-89 needs improvement (orange), and 0-49 is poor (red). Most websites score between 50-70 on mobile. Focus on improving Core Web Vitals rather than chasing a perfect 100.
Core Web Vitals are three metrics Google uses to measure user experience: Largest Contentful Paint (LCP) measures loading speed, Interaction to Next Paint (INP) measures interactivity, and Cumulative Layout Shift (CLS) measures visual stability. They are confirmed Google ranking factors.
Mobile scores are typically lower because the test simulates a mid-tier mobile device on a throttled 4G connection. Desktop tests assume a faster device and connection. This reflects real-world conditions where most users browse on mobile.
Yes. Google has confirmed that page speed is a ranking factor, especially through Core Web Vitals. Faster pages also have lower bounce rates and higher engagement, which indirectly boost rankings through improved user signals.
LCP measures how long it takes for the largest content element (usually a hero image or heading) to become visible. A good LCP is under 2.5 seconds. Common causes of poor LCP include slow server response, render-blocking resources, and large unoptimized images.
CLS measures how much the page layout shifts unexpectedly during loading. A good CLS score is under 0.1. Layout shifts are caused by images without dimensions, dynamically injected content, web fonts causing FOUT/FOIT, and ads or embeds without reserved space.
Test after every major deployment and at least monthly for key pages. Core Web Vitals can change due to third-party script updates, content changes, or server configuration changes. Set up monitoring with Google Search Console for continuous tracking.
Lab data (like this tool provides) comes from simulated tests in a controlled environment. Field data comes from real users via the Chrome User Experience Report (CrUX). Both are valuable: lab data helps diagnose issues, while field data shows actual user experience.
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