Website Speed Checker
Core Web Vitals and performance scoring via Google PageSpeed
Test any URL against Google's PageSpeed Insights API. Get your performance score, Core Web Vitals (LCP, FID, CLS), and specific recommendations for improvement. Mobile and desktop testing available.
FAQ
Website speed FAQ
What are Core Web Vitals?
Core Web Vitals are Google's three key metrics for page experience: Largest Contentful Paint (LCP) measures loading speed, First Input Delay (FID) / Interaction to Next Paint (INP) measures interactivity, and Cumulative Layout Shift (CLS) measures visual stability. Google uses these as direct ranking signals.
What is a good performance score?
90-100 is considered good, 50-89 needs improvement, and below 50 is poor. Most small business websites score between 40-70 on mobile due to unoptimised images, render-blocking CSS/JS, and heavy third-party scripts.
Why is my mobile score lower than desktop?
Mobile testing uses a simulated mid-tier phone on a 4G connection, which is much slower than the fast machine and wired connection used for desktop testing. This is intentional because most of your visitors are on mobile.
How do I improve my LCP?
The most common LCP improvements: optimise and properly size your hero image, use WebP/AVIF format, add width/height attributes to images, preload the LCP image with a link rel=preload tag, and eliminate render-blocking CSS by inlining critical styles.
Does page speed affect SEO?
Yes. Google confirmed Core Web Vitals are ranking signals in 2021. Slow pages also have higher bounce rates and lower conversion rates. A 1-second improvement in LCP can increase conversions by 8-15% according to Google's own case studies.
Need help speeding up your site?
Our AI Operations Audit includes performance analysis and specific recommendations your developer can implement immediately.