Core Web Vitals & PageSpeed
See how fast your pages are, both in a test and for the people who actually visit. Get Google’s own list of improvements and a warning when a release makes things slower.
What's included
- PageSpeed scores and Core Web Vitals for mobile and desktop
- Google’s own improvement list with history over time
- Real-user Core Web Vitals from a small snippet, with alerts
Run a check on any page and get the performance, accessibility, best-practice and SEO scores, the Core Web Vitals (LCP, INP and CLS) plus FCP and TTFB, and the improvements Google recommends. Results are kept so you can see whether your speed work is paying off.
Add a tiny script to your site and you also get real-user data: the same measures from your actual visitors, shown at the 75th percentile per page and device, the way Google judges them. An install check confirms data is arriving, and you are alerted when a metric gets worse.
How it works
A PageSpeed check is a lab test, so scores vary a little with network and server load; the trend over several tests is the useful part. Real-user data fills the gap: it shows what visitors really experience, including slow devices and connections that lab tests miss. The snippet sends only timing values, the page path and device type.
Why both matter
- Lab tests are repeatable and come with a to-do list for developers.
- Real-user data shows which pages are genuinely slow for visitors.
- Alerts catch a slow release quickly, while it is still easy to trace.
What it does not do
The performance score is not a ranking factor in itself, and Core Web Vitals are one signal among many. Pages need visits before real-user data appears, so low-traffic pages may take days to show a useful sample.
Works with the rest of the platform
Speed issues appear in your SEO score and fix list, and performance monitoring keeps watching after you have fixed them.
Frequently asked questions
Why do scores change each time I test?
Lab tests vary with network and server load. Look at the trend over several tests, or use real-user data.
Does the snippet collect personal data?
No. It sends only timing values, the page path and device type.
Why is there no real-user data yet?
Pages need visits. Low-traffic pages may take several days to reach a useful sample.
Is the performance score a ranking factor?
No, the score itself is not. The Core Web Vitals it reports are one of many signals.