Mobile and desktop
See both strategies side by side — mobile often scores lower because of slower CPU and network throttling in Lighthouse.
Website Speed Test
Test how fast any URL loads on mobile and desktop — powered by Google PageSpeed Insights and Lighthouse lab data.
Why test page speed?
Core Web Vitals signals
Review LCP, TBT, CLS, and other lab metrics that correlate with how users experience your page load.
Same engine as Google PSI
Results come from Google PageSpeed Insights API with Lighthouse — comparable to testing in PageSpeed Insights directly.
What does a website speed test measure?
A speed test runs your page through Lighthouse in a controlled lab environment. Google throttles CPU and network differently for mobile vs. desktop, then scores performance, accessibility, best practices, and SEO.
Mobile vs. desktop
Google simulates a mid-tier mobile device and slower network for mobile tests. Desktop uses a faster profile. Always check both — a site that feels fast on your laptop may still score poorly on phones.
Understanding the performance score
The performance score (0–100) weighs metrics like First Contentful Paint, Speed Index, Largest Contentful Paint, Total Blocking Time, and Cumulative Layout Shift. Scores above 90 are considered good in Lighthouse.
Lab data vs. field data
This tool shows lab data from a fresh Lighthouse run. Real-user Core Web Vitals in Search Console or Chrome UX Report can differ because they reflect actual visitors, devices, and networks.
How this checker works
Enter a URL and we request Google PageSpeed Insights twice — once with strategy=mobile and once with strategy=desktop — then display scores and key metrics in one view.
Also preview social sharing for the same URL with our Open Graph scanner.
Speed test FAQ
Enter a URL above for a live mobile and desktop test, or read the sections below.
Yes — we use the official PageSpeed Insights API, which runs Lighthouse under the hood. You get comparable lab scores for mobile and desktop in one place.