Website speed test & audit
Check your performance, SEO, and accessibility scores with Google Lighthouse — plus the exact fixes that would make your site faster. Free, no signup.
Why website speed matters
Site speed is a direct revenue lever. Google's research shows the probability of a visitor bouncing increases 32% as load time goes from 1 to 3 seconds — and every additional second of delay measurably cuts conversions. Speed is also a confirmed Google ranking factor through Core Web Vitals, so a slow site loses twice: fewer visitors find you, and fewer of those who do become customers.
This tool runs Google Lighthouse — the same engine behind PageSpeed Insights — on real Google infrastructure and reports four scores: Performance, SEO, Accessibility, and Best Practices, plus your Core Web Vitals (LCP, CLS, TBT) and the specific fixes that would save the most loading time.
Test the mobile experience first: most traffic is mobile, and it's what Google uses for ranking.
How to run a website speed test
- Enter your URL — type your homepage or any specific page — deep pages like product or blog pages are often slower than the homepage.
- Wait ~30 seconds — Google loads your page on a simulated mobile device and measures every step of the render.
- Read your scores — 90+ (green) is good, 50–89 (orange) needs work, below 50 (red) is actively costing you visitors.
- Check the opportunities — the list shows the fixes with the biggest time savings — usually images, JavaScript, or server response time.
- Re-test after changes — speed work is iterative; measure before and after every significant change.
Frequently asked questions
What is a good website speed score?
A Lighthouse Performance score of 90 or above is considered good, 50–89 needs improvement, and below 50 is poor. For Core Web Vitals specifically, aim for LCP under 2.5 seconds, CLS under 0.1, and TBT under 200 milliseconds.
Do Core Web Vitals affect Google rankings?
Yes. Core Web Vitals (Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint) are part of Google's page experience signals and influence search rankings, especially on competitive queries where content quality is similar.
Why is my website slow?
The most common causes are unoptimized images, too much JavaScript from themes and plugins, slow shared hosting, render-blocking third-party scripts (chat widgets, trackers), and no caching or CDN. The opportunities list in your report shows which of these applies to your site.
Why is my mobile score lower than desktop?
Mobile tests simulate a mid-range phone on a 4G connection, so heavy pages are penalized much more than on desktop hardware. Since Google indexes the mobile version of your site, the mobile score is the one to prioritize.
How do I improve my website speed?
Start with the highest-impact fixes: compress and properly size images (use WebP/AVIF), remove unused JavaScript and third-party scripts, enable caching and a CDN, and upgrade slow hosting. Rebuilding on a modern framework like Next.js typically takes sites from red to green scores.