Tor Metrics Portal: Performance


Time to download files over Tor


The following graphs show the performance of the Tor network as experienced by its users. The graphs contain the average (median) time to request files of three different sizes over Tor as well as first and third quartile of request times. Medians and quartiles are calculated multiple times per day for completed days only, resulting in a delay of 1 to 1.5 days before changes to network performance become visible in the graph.

Torperf graph

Source: all torperf moria siv

50 KiB 1 MiB 5 MiB

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Timeouts and failures of downloading files over Tor


The following graphs show the fraction of timeouts and failures of downloading files over Tor as experienced by users. A timeout occurs when a 50 KiB (1 MiB, 5 MiB) download does not complete within 4:55 minutes (29:55 minutes, 59:55 minutes). A failure occurs when the download completes, but the response is smaller than 50 KiB (1 MiB, 5 MiB).

Torperf failures graph

Source: all torperf moria siv

50 KiB 1 MiB 5 MiB

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Fraction of connections used uni-/bidirectionally


The following graph shows the fraction of connections that is used uni- or bi-directionally. Every 10 seconds, relays determine for every connection whether they read and wrote less than a threshold of 20 KiB. Connections below this threshold are excluded from these statistics. For the remaining connections, relays report whether they read/wrote at least 10 times as many bytes as they wrote/read. If so, they classify a connection as "Mostly reading" or "Mostly writing," respectively. All other connections are classified as "Both reading and writing." After classifying connections, read and write counters are reset for the next 10-second interval. Statistics are aggregated over 24 hours.

Fraction of direct connections used uni-/bidirectionally

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This material is supported in part by the National Science Foundation under Grant No. CNS-0959138. Any opinions, finding, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

"Tor" and the "Onion Logo" are registered trademarks of The Tor Project, Inc.

Data on this site is freely available under a CC0 no copyright declaration: To the extent possible under law, the Tor Project has waived all copyright and related or neighboring rights in the data. Graphs are licensed under a Creative Commons Attribution 3.0 United States License.