Run a free page speed test on any website and see how fast it really loads. PerfDelta measures several pages of your site for mobile and desktop and shows the results in your browser, usually in under a minute. You get the Core Web Vitals that Google uses to judge page experience, plus the lab metrics that reveal why a page is slow.
What this page speed test measures
A single score explains little, so the test keeps two kinds of data apart. Field data comes from real Chrome users and covers the Core Web Vitals: Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift. These are the values Google reads, so they matter for ranking. Lab data comes from a controlled Lighthouse run and explains the causes behind slow load times, such as server response time, Speed Index and blocking time. Seeing both tells you what your users experience and where the problem sits.
How the website speed test works
Enter your URL and start the test. A progress bar tracks each step while the tool finds your sitemap, picks a handful of different pages and measures them for mobile and desktop. When it finishes, the full report opens on screen. Every result gets its own link that stays live for 365 days, so you can bookmark it, send it to a developer or share it with a client. No account, no install. The test runs from the outside, the way a visitor and Google see your site.
Benchmark and competitor comparison
Most tools stop at one number for one page. PerfDelta checks several page types and puts your Core Web Vitals next to the global benchmark. Only about 48 percent of websites pass all three Core Web Vitals on mobile, so you see at a glance whether your site leads or trails. Add up to three competitor domains and the report places their real-user data beside yours.
What the report shows
Per page you get your field values with a clear pass or fail, and the biggest bottleneck across the site. The report breaks page weight down by JavaScript, images, CSS, fonts and HTML, and names the third-party scripts that cost the most, including how long they block the browser. Below that sit the lab metrics for every page, worst first. It is the fast, honest read that tells you where to start.
What usually slows a page down
Four causes show up again and again on slow sites: a slow server response before anything can load, unused JavaScript and CSS the browser downloads anyway, unoptimized images and web fonts, and render-blocking resources that delay the first paint. PerfDelta checks all four automatically and totals the potential savings across every page you test, so you know where to start instead of digging through a wall of numbers.
FAQ
How do I test my website speed?
Enter your URL, start the test and wait on the page. PerfDelta measures several pages for mobile and desktop and shows a full page speed test report in under a minute.
What are Core Web Vitals?
Three real-user metrics Google uses for page experience: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability).
What do LCP and CLS mean, and what are the thresholds?
LCP is how long the largest element takes to appear, CLS measures unexpected layout movement. A page passes at LCP 2.5 seconds or less, INP 200 milliseconds or less, and CLS 0.1 or less.
How is this different from Google PageSpeed Insights?
It uses the same data sources but tests several pages at once, benchmarks your Core Web Vitals against the global average and competitors, and gives you one shareable report instead of a single-page lookup.
Is there a difference between mobile and desktop results?
Often yes, especially on phones. Every page is measured for both, so you see where mobile falls behind.
Is the page speed test free?
Yes, on any website and without an account.
Can I share the result?
Yes. Each report has a link that stays available for 365 days.
How can I improve my page speed?
Start with the heaviest content and the third-party scripts that block the browser. The report ranks these so you fix the load time issues that move the needle first.
Can I test a local or staging site?
No. PerfDelta measures pages the way a real visitor or Google sees them, over the public internet. A site on localhost or behind a login is not reachable from outside, so test the live, public URL instead.
Which page speed test is the most accurate?
It depends what you compare. Lab tools like Lighthouse give a repeatable score under fixed conditions. Field data from the Chrome UX Report shows what real visitors experience. PerfDelta shows both side by side instead of picking one.
Why does Time to First Byte (TTFB) matter?
TTFB measures how long the server takes to respond before anything can load. A slow TTFB delays every metric that comes after it, including LCP. PerfDelta reports it per page, so you can tell a server problem apart from a front-end one.
Do fonts and third-party scripts really slow a site down?
Often, yes. Custom fonts and scripts from ad networks, chat widgets, or analytics tools add extra requests and can block the browser while they load. The report names the heaviest ones and how long each blocks rendering.
What is the difference between PageSpeed Insights and Core Web Vitals?
PageSpeed Insights is the tool. Core Web Vitals are three of the metrics it reports, LCP, INP, and CLS, which Google also uses as a ranking signal. PerfDelta draws on the same underlying data as PageSpeed Insights.