Free Website Speed Test
Test how fast any web page loads. Get your Core Web Vitals, a performance score and a clear fix for everything slowing your page down, powered by the same Lighthouse engine as Google page speed tools like PageSpeed Insights.
How fast does your website load?
A website speed test, also called a page speed checker or website performance test, measures how quickly your pages load and render for real users. DefiniteSEO lets you check your website speed on any URL, grading your Core Web Vitals and every resource on the page, then showing exactly what to fix. Slow pages lose visitors and rankings: Google uses Core Web Vitals as a ranking signal, and the longer a page takes to load, the more people leave before they ever see it.
Your Core Web Vitals, measured and explained
As a Core Web Vitals checker, DefiniteSEO shows the metrics Google actually scores your page on, with real values and pass or fail states, plus a resource waterfall and connection timing so you know exactly what to fix.
- Largest Contentful Paint (LCP)
- Cumulative Layout Shift (CLS)
- Total Blocking Time and interaction responsiveness
- First Contentful Paint and Speed Index
- Time to Interactive
- Server response time and CDN detection
Find everything slowing your page down
The page speed test runs Lighthouse-grade audits and points to the exact resources costing you load time.
Render-blocking resources
CSS and JavaScript that hold up the first paint of your page.
Unused CSS & JavaScript
The code shipped to the browser that the page never actually uses.
Image delivery
Oversized and unoptimised images, and next-gen formats you are missing.
Caching & compression
Cache policy and text compression that cut repeat and transfer time.
Main-thread work
Heavy scripting and long tasks that make the page feel sluggish.
Resource waterfall
Every request in load order, so you can see what blocks what.
Faster pages rank higher and convert better
Page speed is both a Google ranking signal, through Core Web Vitals, and a conversion lever: the longer a page takes to load, the more visitors leave before they see it. A website speed test tells you where you stand and what to fix first, so you keep both your rankings and your visitors.
A free website speed test, in one scan
GTmetrix, Pingdom and Google PageSpeed Insights all test page speed, but leave the SEO fixes to you. DefiniteSEO runs the same Lighthouse-grade speed test and folds it into a full SEO audit with a fix for every issue.
| Capability | DefiniteSEOWebsite Speed Test | GTmetrix | PageSpeed Insights |
|---|---|---|---|
| Free speed test, no signup to start | Yes | Limited | Yes |
| Core Web Vitals with pass or fail | Yes | Yes | Yes |
| Resource waterfall | Yes | Yes | No |
| Named speed audits with a fix for each | Yes | Partial | Partial |
| Runs inside a full 190-point SEO audit | Yes | No | No |
Core Web Vitals, a waterfall and a fix for every issue, free to start.
Competitor capabilities as publicly listed by each vendor, August 2026.
Free SEO tools for every part of your SEO
The Website Speed Test is part of the DefiniteSEO all-in-one AI SEO tool, the full platform for audits, AI visibility and backlinks. Go deeper on the areas that matter most.
Frequently asked questions
What is a website speed test?
A website speed test measures how fast a web page loads and renders. DefiniteSEO reports your Core Web Vitals, a performance score, and a clear fix for everything slowing the page down.
How do I test my website speed?
Paste any URL into the checker to check website speed for free. You will get your load time, Core Web Vitals and a full page speed report, for your own site or a competitor’s.
What are Core Web Vitals?
Core Web Vitals are the speed and stability metrics Google uses to score page experience: Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS) and interaction responsiveness. DefiniteSEO measures each and shows how to improve it.
What is a good page speed score?
Performance is scored from 0 to 100. 90 and above is fast, 50 to 89 needs work, and below 50 is slow. Each Core Web Vital also has its own pass, needs-improvement and fail thresholds.
Does page speed affect SEO?
Yes. Google uses Core Web Vitals as a ranking signal, and faster pages also keep more visitors, so speed affects both your rankings and your conversions.
Is the website speed test free?
Yes. You can run a free page speed test on any URL, with no signup needed to start. It is part of the full DefiniteSEO SEO audit.
How is this different from Google PageSpeed Insights?
DefiniteSEO uses the same Lighthouse engine as PageSpeed Insights, but folds your speed results into a complete SEO audit and gives you a clear fix for every issue, not just a score.
How can I make my website faster?
Compress and lazy-load images, remove unused CSS and JavaScript, enable caching and text compression, cut render-blocking resources, and use a CDN. The speed test flags each of these with a recommended fix.
Test your website speed, free
Paste a URL and get your Core Web Vitals, a performance score and a fix for everything slowing your page down.