We operate two versions of the speed tester, and the method of measuring pages varies accordingly:
Free Version
We retrieve website speed data from the PageSpeed Insights API, always during nighttime hours via Amazon Web Services. Desktop is tested every two days, and mobile is tested every two days as well.
This data is freely available but unstable since Google does not guarantee a consistent testing environment.
The PageSpeed Insights API measures mobile performance using an emulated Moto G4 device on a network with roughly 4G speeds. Desktop testing is conducted on a 10 Mbps connection. The tester's location is in Europe.
PLUS Version
For the paid version of the tester, we have built our own testing infrastructure, which runs each URL through Lighthouse on Amazon Web Services from Frankfurt, Germany. As a result, the data is more stable and better reflects real-world performance.
We also conduct tests more frequently. Every URL is tested daily, five times in a row, to minimize extremes and fluctuations, both on mobile and desktop.
With the PLUS version, you also receive more detailed technical data, including a Trace export of the page rendering process, which can be opened in Chrome DevTools.
Our infrastructure tests using an emulated Moto G Power device, running Lighthouse 11.1.0 and Chrome 114..
Chrome UX Report
In both versions, we also fetch user data from Google's Chrome UX Report for both domains and specific URLs.
We retrieve monthly data once a month and rolling 28-day data for URLs and domains on a daily basis.