[dolphin] [Bug 453523] New: Dolphin SFTP very slow transfer

[Andrus Lepik]

https://bugs.kde.org/show_bug.cgi?id=453523

            Bug ID: 453523
           Summary: Dolphin SFTP very slow transfer
           Product: dolphin
           Version: 21.12.3
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: alepik at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
I've experienced extremely slow SFTP file copy to remote in Dolphin (~250kb/s)
ever since I can remember. It's not a connection issue, tested by logging in
through SFTP and putting the file, the speeds were as good as expected
(~7.5mb/s). I also tested using scp in shell, the speeds were good. 
For testing I used one large file of about 800mb to eradicate small file copy
issues.

STEPS TO REPRODUCE
Copy any file to remote server using Dolphin and SFTP.

OBSERVED RESULT
Dolphin SFTP copy is over 20 times slower than SFTP through shell.

EXPECTED RESULT
Roughly comparable speeds in Dolphin SFTP and shell SFTP.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro Linux 21.2.6 Qonos
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3

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