Page Speed Test: Median of 3 PageSpeed Runs and CrUX Data
A single PageSpeed run jumps by ±10–15 points, so conclusions drawn from it are unreliable. Here the page is measured 3 times, the table shows the median, and next to it you get Chrome field data (CrUX): what your visitors actually experienced over the last 28 days.
Your checks
How to use it
- Paste the full page URL, e.g. https://site.com/category/.
- Choose the device. For most sites mobile is what matters: it’s the version Google uses for ranking.
- Click “Test speed”. The page is measured 3 times, which takes up to a minute.
- Look at the cell colors and click a row to see which element slows down the first screen.
Green means good, yellow needs improvement, red is poor. The thresholds are Google’s official ones: LCP up to 2.5 s, CLS up to 0.1, INP up to 200 ms. For search, Google uses CrUX field data; lab metrics are there to find the cause and check fixes right away.
Why I built this tool
When I was speeding up a food delivery website on OpenCart, it turned out PageSpeed gave the same page 73 one time and 93 the next, and LCP anywhere from 1.5 to 11 seconds. With a single run you can’t tell whether a fix helped.
So I measured every change 10 times and looked at the median. That’s how we saw mobile LCP on the homepage drop from 5.1 to 1.8 s, and later Search Console confirmed it: all 401 URLs were in the green zone.
This tool does the same automatically. For myself I measure dozens of pages at once, and here anyone can test their page for free.
FAQ
Why is the PageSpeed result different every time?
Each run is a separate Lighthouse run on Google’s servers with different load, network conditions and script loading order. A spread of ±10–15 points is normal, so look at the median of several runs.
What is CrUX and how is it different from lab metrics?
CrUX is real Chrome user data for the last 28 days (75th percentile). This is what Google uses as Core Web Vitals for search. Lab metrics simulate a single page load: they help find causes and check fixes.
Why is there no CrUX data?
Google shows field data only for pages and sites with enough Chrome visitors. New or low-traffic sites don’t have it; in that case rely on lab metrics.
What is the LCP element?
The largest element on the first screen: a photo, banner or text block. The time it appears is the LCP. If it’s an image, compress it and load it first; if it’s text, look for fonts, CSS and scripts that block rendering.
Why only 5 checks a day?
Each check is 3 requests to Google, and the quota is shared by everyone using the site. If you need many pages measured, get in touch.
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