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Tor, one of the most popular censorship circumvention systems, faces regularblocking attempts by censors. Thus, to facilitate access, it relies on"pluggable transports" (PTs) that disguise Tor's traffic and make it hard forthe adversary to block Tor. However, these are not yet well studied andcompared for the performance they provide to the users. Thus, we conduct afirst comparative performance evaluation of a total of 12 PTs -- the onescurrently supported by the Tor project and those that can be integrated in thefuture.  Our results reveal multiple facets of the PT ecosystem. (1) PTs' downloadtime significantly varies even under similar network conditions. (2) All PTsare not equally reliable. Thus, clients who regularly suffer censorship mayfalsely believe that such PTs are blocked. (3) PT performance depends on theunderlying communication primitive. (4) PTs performance significantly dependson the website access method (browser or command-line). Surprisingly, for somePTs, website access time was even less than vanilla Tor.  Based on our findings from more than 1.25M measurements, we providerecommendations about selecting PTs and believe that our study can facilitateaccess for users who face censorship.

PTPerf: On the performance evaluation of Tor Pluggable Transports