Issue 164 – Slow file transfers

2008-02-28 10:26

Related: Issue 1, Issue 17.
Also WinSCP 4.1 will support (less secure) Arcfour cipher, which should be fast.

2008-02-28 10:52

WinSCP (FAR plugin 1.5.1 based on WinSCP 3.8.2) is as fast as PSCP (8 MB/s) and SFTP (3 MB/s) (PuTTY 0.60):
https://winscp.net/forum/viewtopic.php?t=3137

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WinSCP 3.8.2 is as fast on upload as SSH Secure Shell 3.2.9, but much slower on download on WinXP. On Win2K it is as fast:
https://winscp.net/forum/viewtopic.php?t=4684

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Transfer rate is capped at 100KBps:
https://winscp.net/forum/viewtopic.php?t=5277
https://winscp.net/forum/viewtopic.php?t=5313

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SCP significantly faster than SFTP:
https://winscp.net/forum/viewtopic.php?t=5096

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https://winscp.net/forum/viewtopic.php?t=2455

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PuTTY 0.59 much faster than 0.58:
https://winscp.net/forum/viewtopic.php?t=4366#14104

2009-03-02 08:22

WinSCP 4.2.1 almost twice as fast as WinSCP 4.1.8 on Windows Vista:
https://winscp.net/forum/viewtopic.php?t=6614

2009-07-03 08:13

Suggestion for fixing network speed after installing SP2 for Vista:
https://winscp.net/forum/viewtopic.php?t=6905#24994

2009-08-19 08:39

Fixing network speed in Windows XP:
https://winscp.net/forum/viewtopic.php?t=5277#25801

2010-10-16 20:46

It has been suggested by ultramage that increasing SSH socket buffer size may instead transfer speed. See Issue 615.

2011-11-11 09:35

Issue 615 has been rolled back by Issue 677 as some users were having problems with it.
The fix was reintroduced by Issue 690, with option to disable it, in WinSCP 5.0.3.

2016-05-17 09:33

Issue 787: WinSCP 5.0.6: When Optimize connection buffer size is enabled, also FTP socket internal buffer size is increased.

2016-05-17 09:33

Issue 1141: WinSCP 5.2.2: Increase local SSH send buffer to improve performance

2016-05-17 09:33

Issue 1273: WinSCP 5.7: Size of connection receiving buffer increased.

2016-05-17 09:34

WinSCP 5.8: Improved transfer speed:
– with SFTP and SCP protocols when CPU is limiting factor.
– with SFTP on high latency connections Issue 1295

2016-05-19 09:21

WinSCP 5.8.3: Dynamically increase TCP send buffer on fast connections.

2018-01-11 09:09

https://winscp.net/forum/viewtopic.php?t=25705

2019-06-14 09:13

S3 specific entry: Issue 1732

2019-07-21 10:40

Issue 1769: Hardware accelerated AES (AES-NI)