What SpeedVitals measures
SpeedVitals runs Lighthouse style measurements from a set of test servers spread across continents and reports Core Web Vitals for each one. It also grades your page on device tiers, so you can see the gap between a high end phone and a cheap one. The layout shift visualiser draws boxes around the parts of your page that moved while loading.
How to read your result
Compare the locations against each other before you worry about the absolute numbers. Similar results everywhere means the page itself is the limiting factor. One region much worse than the rest means the problem is hosting distance or a missing CDN, and no amount of image compression will fix it. The device tier comparison matters if you sell to a market where older phones are common.
What to change first
If one continent is dramatically slower, put a CDN in front of the site. If every location is slow by a similar margin, the page weight and the render path are the problem, so work on the largest image and the scripts loading in the head.
Common questions
- How is this different from PageSpeed Insights?
- PageSpeed Insights tests from one Google location. SpeedVitals tests from several at once, which is what exposes a hosting or CDN problem rather than a page problem.
- What does the layout shift visualiser show?
- It marks the elements that moved position while the page was loading, which is what Cumulative Layout Shift measures. Usually it points at images or ads with no reserved height.
Related tests
Run this alongside every other test in Website Speed Tests, or start from the full list of website testing tools.