Internet Speed Test
Throughput is measured in Mbit/s, latency in milliseconds, and jitter is the variation between latency samples. The result describes the path to the nearest test server only.
Internet Speed Test
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How this test works
Method: one run, three phases. Idle latency is the median of sequential requests to the nearest Cloudflare server. Download uses parallel streams of static files, and upload sends POST bodies from 4 MiB up to 64 MiB. Quick mode, the default on computers: 10 probes, 6 s per direction, 3 streams, 1.5 s discarded, cap 100 MiB per direction. Full mode: 20 probes, 10 s, 2 s discarded, cap 300 MiB.
How to read the result
Speed is the transferred bytes over the window after the discarded start, in Mbit/s. A window shorter than 250 ms gives no speed value. Jitter is the mean absolute difference of consecutive idle samples. Loaded latency is the median of probes sent every 200 ms inside the window. Loss of packets is outside this test.
What is typical
Reference limits of the rule set for a likely verdict: HD video 5 Mbit/s, 4K video 20 Mbit/s. Call: 4.0 Mbit/s down, 3.8 Mbit/s up, latency under 100 ms. Browsing: more than 2 Mbit/s down, more than 0.1 Mbit/s up, latency under 500 ms. Each limit cites a published source in the code.
What to do if it is bad
The estimates list the metrics that limited them, and a missing metric is reported as missing. For visitors in Russia the test starts with M-Lab NDT7, which reports no jitter and one stream, so values can differ between engines.