[Cyberduck-trac] [Cyberduck] #185: Slow SFTP transfers

Cyberduck trac at trac.cyberduck.ch
Mon Nov 15 18:52:39 CET 2010

#185: Slow SFTP transfers
    Reporter:  wout.mertens@…          |        Owner:  dkocher      
        Type:  enhancement             |       Status:  closed       
    Priority:  high                    |    Milestone:  4.0          
   Component:  sftp                    |      Version:  3.5          
    Severity:  major                   |   Resolution:  fixed        
    Keywords:                          |     Platform:  Mac OS X 10.6
Architecture:  Intel                   |  

Comment (by dkocher):

 Replying to [comment:74 caeies]:
 > Hum, still the download speed issue. I tried a higher parallelism factor
 but that doesn't help. My last guess is that perhaps we are hitting
 performances issues in the code of the download. The window size is always
 "low" no more than ~98343 when the window size of sftp is higher + 134K).
 > Unfortunately I don't have the time to profile cyberduck and to look at
 where is the bottleneck. Probably in the write parts of the download
 requests (But that could be my computer too :). I guess that cyberduck is
 near its maximum performance regarding the network layout (As the upload
 speed seems to indicate).
 > I will be glad to test new code.

 I'll leave this closed this until we find clear evidence of other areas
 for improvement.

Ticket URL: <http://trac.cyberduck.ch/ticket/185#comment:77>
Cyberduck <http://cyberduck.ch>
Open source FTP, SFTP, WebDAV, Cloud Files, Google Docs & Amazon S3 Browser for Mac & Windows.

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