Free Page Speed Checker — Website Performance Analyzer

Q: How does page speed and Core Web Vitals affect search rankings?

Google officially uses Core Web Vitals (LCP, CLS, and INP/TBT) as direct search ranking signals. Slow-loading pages experience higher bounce rates, lower time-on-page, and reduced conversion rates. Fast sites achieve superior user experience signals and priority indexing.

Q: What are the recommended thresholds for Core Web Vitals?

Google recommends a Largest Contentful Paint (LCP) under 2.5 seconds, First Contentful Paint (FCP) under 1.8 seconds, Cumulative Layout Shift (CLS) under 0.1, and Total Blocking Time (TBT) under 200 milliseconds for at least 75% of page visits.

Q: How does page speed impact search engine crawl budget?

Server latency and heavy page weight directly limit crawl budget. If a server responds slowly (high Time to First Byte), Googlebot restricts its crawl rate to avoid overloading the host, leaving newer pages uncrawled. Fast servers enable search engines to index more pages in less time.

⚡ Google Lighthouse scores

📱 Mobile & Desktop modes

📊 Core Web Vitals (LCP, FCP, CLS)

✅ Free — No signup required

⏳ Analyzing page speed... this may take 15–30 seconds

🚀 Opportunities & Diagnostics

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Why Page Speed Matters for SEO

Google's Core Web Vitals are official ranking factors. Slow pages rank lower, have higher bounce rates, and convert less. A 1-second delay in mobile load time reduces conversions by 20%. Google PageSpeed score directly affects your Search ranking.

Our tool checks load time, compression, caching, and key SEO elements. Add your free Google API key to unlock full Lighthouse scores including LCP, FCP, CLS and Total Blocking Time.

Core Web Vitals Explained

LCP — Largest Contentful Paint: < 2.5s good, > 4s poor. How long until the main content loads.

FCP — First Contentful Paint: < 1.8s good. Time until first text or image appears.

CLS — Cumulative Layout Shift: < 0.1 good. Measures visual stability — do elements jump around?

TBT — Total Blocking Time: < 200ms good. How long the main thread is blocked from user input.

⚡ Generative Engine Optimization & Core Web Vitals Guide

What is a Page Speed Checker & Why Does It Impact SEO?

A page speed checker measures latency, server response times, and Google Core Web Vitals including LCP, FCP, and CLS. Fast-rendering websites conserve crawler resources, reduce bounce rates, and satisfy Google's mobile-first performance ranking algorithms. Optimizing critical render paths directly improves user conversion rates and boosts organic search visibility.

Frequently Asked Questions

Google officially uses Core Web Vitals (LCP, CLS, and INP/TBT) as direct search ranking signals. Slow-loading pages experience higher bounce rates, lower time-on-page, and reduced conversion rates. Fast sites achieve superior user experience signals and priority indexing.

Google recommends a Largest Contentful Paint (LCP) under 2.5 seconds, First Contentful Paint (FCP) under 1.8 seconds, Cumulative Layout Shift (CLS) under 0.1, and Total Blocking Time (TBT) under 200 milliseconds for at least 75% of page visits.

Server latency and heavy page weight directly limit crawl budget. If a server responds slowly (high Time to First Byte), Googlebot restricts its crawl rate to avoid overloading the host, leaving newer pages uncrawled. Fast servers enable search engines to index more pages in less time.

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