We use Torperf and OnionPerf to run performance measurements. Both work by fetching files of different sizes over Tor and measuring how long that takes.
This graph shows the fraction of timeouts and failures when downloading static files of different sizes over Tor, either from a server on the public internet or from an onion server. A timeout occurs when a download does not complete within the scheduled time, in which case it is aborted in order not to overlap with the next scheduled download. A failure occurs when the download completes, but the response is smaller than expected.
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