LibreSpeed is a lightweight web browser-based speed test server running on your Pi. It is implemented in JavaScript using XHR (XMLHttpRequest) that runs in a web browser. No special client application is needed, so you can run this on any device which has a web browser.
Go ahead! Hit that START
button.
Make sure you think carefully about what link is "actually" being measured when you use this tool!
How did we get the extra details on this screen?
LibreSpeed is a service running on the WLAN Pi, and therefore you are testing the link speed between the device (you are viewing the page with) and the WLAN Pi. This particular configuration of LibreSpeed is not measuring the Internet link speed.
Hover over SPEED TEST
in the menu bar and select SPEED TEST (DETAILS)
for the view with extra details.