Internet speed test

The figure is decimal megabits per second, the same unit internet providers advertise, computed from bytes actually received over wall-clock time; when a file reports no readable bytes, the Resource Timing transfer size stands in. Results reflect the route between you and this site's server, not a nearby speedtest edge, so a distant server reads slower than your line's true ceiling. Wi-Fi, VPNs, and other traffic on the link all show up in the number, which is fair: that is the connection you actually use. Upload is not measured, and a single stream cannot saturate a very fast line, which is why the test climbs through progressively larger files until a byte floor or a time cap stops it. Nothing runs until you press the button, and retesting right away is safe: every fetch is cache-busted so no result can come from your browser cache.