Measures latency, jitter, and throughput from this browser to the nearest edge server. Latency and jitter are the numbers that actually predict whether video calls and cloud apps hold up — throughput alone rarely explains a bad connection.
Round-trip time to the server, reported as the lowest clean measurement rather than an average — the minimum is closer to the true path delay, since averages get dragged upward by one-off scheduling hiccups. Under 30 ms is excellent, under 60 ms is fine for anything, and above 150 ms starts to be noticeable in conversation on a video call.
How much the latency varies between consecutive measurements. This is the most under-appreciated number on the page. A connection with 40 ms latency and 3 ms jitter will carry a video call cleanly; the same 40 ms with 40 ms of jitter will sound choppy, because voice and video packets arrive unevenly and the receiver has to either wait or drop them. If calls are bad but the speed number looks fine, jitter is usually the reason.
Throughput in megabits per second, measured with several parallel connections. Upload matters more than most people expect — your camera feed on every video call goes up, not down, and a connection sold as "500 Mbps" is often 500 down and 20 up.
Wi-Fi is the single most common bottleneck and it hides here — a test over Wi-Fi measures your wireless link as much as your internet connection. Retest wired before concluding anything about the circuit itself. This also cannot see packet loss under load, buffer bloat, or which of several hops is degrading, all of which need testing from the network rather than from a browser tab.
One thing it can tell you: if the download figure comes back above about 95 Mbps, your cabling and switch port are negotiating faster than 100 Mbps, because that is the hard ceiling for application traffic on a 100BASE-TX link. A result pinned just under 95 Mbps on a connection sold as faster is worth investigating — a damaged cable with only two usable pairs, or a port that negotiated down, will do exactly that.
Slow links often trace back to a misconfigured circuit, an oversubscribed uplink, or a contract that quietly renewed at the wrong speed. That is worth looking at properly.
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