Largest Contentful Paint (LCP)
Measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds.
Technical SEO Tools · Free Tool
Core Web Vitals & PageSpeed Analyzer
Measure real-user and lab Core Web Vitals to identify speed bottlenecks, layout shifts, and server response delays affecting search rankings.
Step-by-step workflow
How the Core Web Vitals & PageSpeed Analyzer Works
Run a real-time diagnostic scan in four simple steps — no sign-up or software installation required.
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01
Submit webpage address
Type your webpage address (including https://) to initiate the automated speed and performance diagnostic.
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02
Fetch lab & field metrics
Our engine queries Google PageSpeed Insights and measures direct server-side response timings.
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03
Review Core Web Vitals
Inspect Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Total Blocking Time (TBT).
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04
Deploy speed fixes
Prioritize recommendations by potential time savings to accelerate page loads and elevate SEO scores.
Diagnostic coverage
What This Tool Checks
Verified against modern search engine quality guidelines and technical best practices.
Cumulative Layout Shift (CLS)
Measures visual stability. Pages should maintain a CLS of 0.1 or less to prevent layout jumping.
Total Blocking Time (TBT)
Measures page responsiveness during load. TBT should remain under 200 milliseconds.
Server Response Time (TTFB)
Measures direct server response latency. Fast server response (under 800ms) accelerates rendering.
Practical best practices
How to Fix Common Issues
Practical steps to resolve common deficiencies and improve search visibility.
Optimize Hero & Banner Images
Preload above-the-fold hero images, convert assets to WebP or AVIF formats, and set explicit aspect ratios.
Reserve Dimensions to Prevent CLS
Specify width and height attributes on all images, videos, and dynamic ad containers to stop layout shifts.
Defer Non-Essential JavaScript
Code-split scripts, defer non-critical third-party trackers, and eliminate render-blocking stylesheet links.
Enable Edge Caching and CDN
Utilize a content delivery network (CDN) and browser caching rules to serve cached HTML and static assets instantly.
Questions & answers
Frequently Asked Questions
Everything you need to know about using this tool and understanding your results.
What are Google Core Web Vitals?
Core Web Vitals are a standardized set of speed, responsiveness, and visual stability metrics defined by Google that directly impact search engine rankings and user satisfaction.
What is a good LCP score?
A good Largest Contentful Paint (LCP) measurement is 2.5 seconds or less on mobile and desktop devices according to Google's official performance guidelines.
What replaced FID in Core Web Vitals?
Interaction to Next Paint (INP) officially replaced First Input Delay (FID) as a core responsiveness metric in March 2024 to measure overall page responsiveness.
How does Cumulative Layout Shift (CLS) affect SEO?
CLS measures unexpected layout shifts during page loading; a score below 0.1 prevents irritating visual movement that causes accidental clicks and ranking penalties.
How can I improve my Core Web Vitals quickly?
Compress and modernize image formats to WebP or AVIF, reserve layout dimensions on media elements, remove unused JavaScript, and enable edge server caching.
Looking for deeper analysis?
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Free tools analyze one page at a time. Our multi-page SEO audits crawl up to 50 pages to uncover site-wide technical bottlenecks, broken links, and metadata gaps.
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