0

Recently we updated our WinScp from 5.1.3 to 5.7.3, the problem is our SFTP upload speed is very low compared to the older version (new: 250KB/s vs old: 2.7MB/s), but normal FTP is not affected, we create sessions with default parameters in both versions, unfortunately I couldn't found any documentation regarding to this problem on the official website.

Is there any configuration that we are missing here which cause this huge difference?

UPDATE

Log from 5.7.3

. 2015-06-06 19:04:36.665 --------------------------------------------------------------------------
. 2015-06-06 19:04:36.666 WinSCP Version 5.7.3 (Build 5438) (OS 6.1.7601 Service Pack 1 - Windows 7 Professional)
. 2015-06-06 19:04:36.666 Configuration: HKCU\Software\Martin Prikryl\WinSCP 2\
. 2015-06-06 19:04:36.666 Log level: Normal, Logging passwords
. 2015-06-06 19:04:36.666 Local account: Lenoardo\Hesenpai
. 2015-06-06 19:04:36.666 Working directory: C:\Users\Hesenpai\Downloads\WinScp\winscp573
. 2015-06-06 19:04:36.666 Process ID: 78112
. 2015-06-06 19:04:36.666 Command-line: "C:\Users\Hesenpai\Downloads\WinScp\winscp573\WinSCP.exe" 
. 2015-06-06 19:04:36.666 Time zone: Current: GMT+4:30, Standard: GMT+3:30 (Iran Standard Time), DST: GMT+4:30 (Iran Daylight Time), DST Start: 3/21/2015, DST End: 9/21/2015
. 2015-06-06 19:04:36.666 Login time: Saturday, June 06, 2015 7:04:36 PM
. 2015-06-06 19:04:36.666 --------------------------------------------------------------------------
. 2015-06-06 19:04:36.666 Session name: admin@192.168.1.104 (Ad-Hoc site)
. 2015-06-06 19:04:36.666 Host name: 192.168.1.104 (Port: 22)
. 2015-06-06 19:04:36.666 User name: admin (Password: admin, Key file: No)
. 2015-06-06 19:04:36.666 Tunnel: No
. 2015-06-06 19:04:36.666 Transfer Protocol: SFTP (SCP)
. 2015-06-06 19:04:36.666 Ping type: -, Ping interval: 30 sec; Timeout: 15 sec
. 2015-06-06 19:04:36.666 Disable Nagle: No
. 2015-06-06 19:04:36.666 Proxy: none
. 2015-06-06 19:04:36.666 Send buffer: 262144
. 2015-06-06 19:04:36.666 SSH protocol version: 2; Compression: No
. 2015-06-06 19:04:36.666 Bypass authentication: No
. 2015-06-06 19:04:36.666 Try agent: Yes; Agent forwarding: No; TIS/CryptoCard: No; KI: Yes; GSSAPI: No
. 2015-06-06 19:04:36.667 Ciphers: aes,blowfish,3des,WARN,arcfour,des; Ssh2DES: No
. 2015-06-06 19:04:36.667 KEX: dh-gex-sha1,dh-group14-sha1,dh-group1-sha1,rsa,WARN
. 2015-06-06 19:04:36.667 SSH Bugs: A,A,A,A,A,A,A,A,A,A,A
. 2015-06-06 19:04:36.667 Simple channel: Yes
. 2015-06-06 19:04:36.667 Return code variable: Autodetect; Lookup user groups: A
. 2015-06-06 19:04:36.667 Shell: default
. 2015-06-06 19:04:36.667 EOL: 0, UTF: 2
. 2015-06-06 19:04:36.667 Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes
. 2015-06-06 19:04:36.667 LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No
. 2015-06-06 19:04:36.667 SFTP Bugs: A,A
. 2015-06-06 19:04:36.667 SFTP Server: default
. 2015-06-06 19:04:36.667 Local directory: default, Remote directory: home, Update: Yes, Cache: Yes
. 2015-06-06 19:04:36.667 Cache directory changes: Yes, Permanent: Yes
. 2015-06-06 19:04:36.667 DST mode: 1
. 2015-06-06 19:04:36.667 --------------------------------------------------------------------------
. 2015-06-06 19:04:36.767 Looking up host "192.168.1.104"
. 2015-06-06 19:04:36.767 Connecting to 192.168.1.104 port 22
. 2015-06-06 19:04:41.781 Server version: SSH-2.0-CoreFTP-0.3.3
. 2015-06-06 19:04:41.781 Using SSH protocol version 2
. 2015-06-06 19:04:41.781 We claim version: SSH-2.0-WinSCP_release_5.7.3
. 2015-06-06 19:04:41.784 Doing Diffie-Hellman group exchange
. 2015-06-06 19:04:41.808 Doing Diffie-Hellman key exchange with hash SHA-256
. 2015-06-06 19:04:42.605 Verifying host key rsa2 0x10001,0xc8ddef427f870847 3a75b5dbe94a2f83 c987e09c60e16208 0861960220c9071f c746728db9fdf1d2 f6893bfe61baa849 a395b0663303a72c 6460d21a168d8405 af092136521bb718 2f74d8d550fb2837 4ae7f72924c7767f c48c9a81fe4a210a ab5e926e76e45728 49b509825d899bad 24a1813e301c4438 de4fceca8f457769  with fingerprint ssh-rsa 1024 0d:5f:93:b3:48:9f:5c:60:a3:31:29:c3:38:5f:20:57
. 2015-06-06 19:04:42.631 Host key matches cached key
. 2015-06-06 19:04:42.631 Host key fingerprint is:
. 2015-06-06 19:04:42.631 ssh-rsa 1024 0d:5f:93:b3:48:9f:5c:60:a3:31:29:c3:38:5f:20:57
. 2015-06-06 19:04:42.631 Initialised AES-256 SDCTR client->server encryption
. 2015-06-06 19:04:42.631 Initialised HMAC-SHA-256 client->server MAC algorithm
. 2015-06-06 19:04:42.635 Initialised AES-256 SDCTR server->client encryption
. 2015-06-06 19:04:42.635 Initialised HMAC-SHA-256 server->client MAC algorithm
! 2015-06-06 19:04:42.639 Using username "admin".
. 2015-06-06 19:04:42.696 Prompt (password, "SSH password", <no instructions>, "&Password: ")
. 2015-06-06 19:04:42.696 Using stored password.
. 2015-06-06 19:04:42.749 Sent password
. 2015-06-06 19:04:42.758 Access granted
. 2015-06-06 19:04:42.758 Opening session as main channel
. 2015-06-06 19:04:42.762 Opened main channel
. 2015-06-06 19:04:42.784 Started a shell/command
. 2015-06-06 19:04:42.802 --------------------------------------------------------------------------
. 2015-06-06 19:04:42.802 Using SFTP protocol.
. 2015-06-06 19:04:42.803 Doing startup conversation with host.
> 2015-06-06 19:04:42.857 Type: SSH_FXP_INIT, Size: 5, Number: -1
< 2015-06-06 19:04:43.065 Type: SSH_FXP_VERSION, Size: 5, Number: -1
. 2015-06-06 19:04:43.065 SFTP version 3 negotiated.
. 2015-06-06 19:04:43.065 We believe the server has signed timestamps bug
. 2015-06-06 19:04:43.065 We will use UTF-8 strings until server sends an invalid UTF-8 string as with SFTP version 3 and older UTF-8 string are not mandatory
. 2015-06-06 19:04:43.065 Getting current directory name.
. 2015-06-06 19:04:43.066 Getting real path for '.'
> 2015-06-06 19:04:43.066 Type: SSH_FXP_REALPATH, Size: 10, Number: 16
< 2015-06-06 19:04:43.069 Type: SSH_FXP_NAME, Size: 23, Number: 16
. 2015-06-06 19:04:43.069 Real path is '/'
. 2015-06-06 19:04:43.262 Listing directory "/".
> 2015-06-06 19:04:43.262 Type: SSH_FXP_OPENDIR, Size: 10, Number: 267
< 2015-06-06 19:04:43.270 Type: SSH_FXP_HANDLE, Size: 22, Number: 267
> 2015-06-06 19:04:43.270 Type: SSH_FXP_READDIR, Size: 22, Number: 524
< 2015-06-06 19:04:43.274 Type: SSH_FXP_NAME, Size: 114, Number: 524
> 2015-06-06 19:04:43.274 Type: SSH_FXP_READDIR, Size: 22, Number: 780
< 2015-06-06 19:04:43.278 Type: SSH_FXP_STATUS, Size: 28, Number: 780
< 2015-06-06 19:04:43.278 Status code: 1
> 2015-06-06 19:04:43.278 Type: SSH_FXP_CLOSE, Size: 22, Number: 1028
. 2015-06-06 19:04:43.278 files;D;0;2015-06-06T14:31:46.000Z;"" [0];"" [0];rw-rw-rw-;1
. 2015-06-06 19:04:43.362 Startup conversation with host finished.
. 2015-06-06 19:05:31.606 Copying 1 files/directories to remote directory "/"
. 2015-06-06 19:05:31.607   PrTime: Yes; PrRO: No; Rght: rw-r--r--; PrR: No (No); FnCs: N; RIC: 0100; Resume: S (102400); CalcS: Yes; Mask: *.*
. 2015-06-06 19:05:31.607   TM: B; ClAr: No; RemEOF: No; RemBOM: No; CPS: 0; NewerOnly: No; InclM: ; ResumeL: 0
. 2015-06-06 19:05:31.607   AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; *.js; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml
. 2015-06-06 19:05:31.607 File: 'C:\test.report' [2015-03-17T01:14:34.000Z] [7950478]
. 2015-06-06 19:05:31.607 Copying "C:\test.report" to remote directory started.
. 2015-06-06 19:05:31.608 Binary transfer mode selected.
. 2015-06-06 19:05:31.608 Checking existence of file.
> 2015-06-06 19:05:31.608 Type: SSH_FXP_LSTAT, Size: 21, Number: 1287
< 2015-06-06 19:05:31.608 Type: SSH_FXP_STATUS, Size: 24, Number: 1028
. 2015-06-06 19:05:31.608 Discarding reserved response
< 2015-06-06 19:05:31.617 Type: SSH_FXP_STATUS, Size: 29, Number: 1287
< 2015-06-06 19:05:31.617 Status code: 2
. 2015-06-06 19:05:31.617 Checking existence of partially transfered file.
> 2015-06-06 19:05:31.617 Type: SSH_FXP_LSTAT, Size: 30, Number: 1543
< 2015-06-06 19:05:31.621 Type: SSH_FXP_STATUS, Size: 29, Number: 1543
< 2015-06-06 19:05:31.621 Status code: 2
. 2015-06-06 19:05:31.621 Opening remote file.
> 2015-06-06 19:05:31.621 Type: SSH_FXP_OPEN, Size: 46, Number: 1795
< 2015-06-06 19:05:31.630 Type: SSH_FXP_HANDLE, Size: 23, Number: 1795
> 2015-06-06 19:05:31.631 Type: SSH_FXP_WRITE, Size: 4131, Number: 2310
. 2015-06-06 19:06:56.918 501 skipped SSH_FXP_WRITE, SSH_FXP_READ, SSH_FXP_DATA and SSH_FXP_STATUS packets.
> 2015-06-06 19:06:56.918 Type: SSH_FXP_CLOSE, Size: 23, Number: 67076
< 2015-06-06 19:06:56.918 Type: SSH_FXP_STATUS, Size: 24, Number: 66054
< 2015-06-06 19:06:57.659 Type: SSH_FXP_STATUS, Size: 24, Number: 66310
< 2015-06-06 19:06:58.851 Type: SSH_FXP_STATUS, Size: 24, Number: 66566
< 2015-06-06 19:07:00.357 Type: SSH_FXP_STATUS, Size: 24, Number: 66822
< 2015-06-06 19:07:00.561 Type: SSH_FXP_STATUS, Size: 24, Number: 67076
< 2015-06-06 19:07:00.561 Status code: 0
> 2015-06-06 19:07:00.561 Type: SSH_FXP_RENAME, Size: 46, Number: 67346
< 2015-06-06 19:07:00.567 Type: SSH_FXP_STATUS, Size: 24, Number: 67346
< 2015-06-06 19:07:00.567 Status code: 0
. 2015-06-06 19:07:00.567 Preserving timestamp [2015-03-17T01:14:34.000Z]
> 2015-06-06 19:07:00.567 Type: SSH_FXP_SETSTAT, Size: 33, Number: 2057
< 2015-06-06 19:07:00.571 Type: SSH_FXP_STATUS, Size: 24, Number: 2057
< 2015-06-06 19:07:00.571 Status code: 0
. 2015-06-06 19:07:00.571 Transfer done: 'C:\test.report' [7950478]
. 2015-06-06 19:07:00.572 Listing directory "/".
> 2015-06-06 19:07:00.572 Type: SSH_FXP_OPENDIR, Size: 10, Number: 67595
< 2015-06-06 19:07:00.577 Type: SSH_FXP_HANDLE, Size: 22, Number: 67595
> 2015-06-06 19:07:00.577 Type: SSH_FXP_READDIR, Size: 22, Number: 67852
< 2015-06-06 19:07:00.581 Type: SSH_FXP_NAME, Size: 231, Number: 67852
> 2015-06-06 19:07:00.582 Type: SSH_FXP_READDIR, Size: 22, Number: 68108
< 2015-06-06 19:07:00.586 Type: SSH_FXP_STATUS, Size: 28, Number: 68108
< 2015-06-06 19:07:00.586 Status code: 1
> 2015-06-06 19:07:00.586 Type: SSH_FXP_CLOSE, Size: 22, Number: 68356
. 2015-06-06 19:07:00.586 files;D;0;2015-06-06T14:31:46.000Z;"" [0];"" [0];rw-rw-rw-;1
. 2015-06-06 19:07:00.586 test.report;-;7950478;2015-03-17T01:14:34.000Z;"" [0];"" [0];rw-rw-rw-;1
. 2015-06-06 19:07:06.345 Closing connection.
. 2015-06-06 19:07:06.345 Sending special code: 12
. 2015-06-06 19:07:06.345 Sent EOF message

Log from 5.1.3

. 2015-06-06 18:56:01.474 --------------------------------------------------------------------------
. 2015-06-06 18:56:01.474 WinSCP Version 5.1.3 (Build 2881) (OS 6.1.7601 Service Pack 1)
. 2015-06-06 18:56:01.474 Configuration: HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\
. 2015-06-06 18:56:01.475 Local account: Lenoardo\Hesenpai
. 2015-06-06 18:56:01.475 Working directory: C:\Users\Hesenpai\Downloads\WinScp\winscp513
. 2015-06-06 18:56:01.475 Command-line: "C:\Users\Hesenpai\Downloads\WinScp\winscp513\WinSCP.exe" 
. 2015-06-06 18:56:01.475 Time zone: Current: GMT+4:30, Standard: GMT+3:30, DST: GMT+4:30, DST Start: 3/21/2015, DST End: 9/21/2015
. 2015-06-06 18:56:01.475 Login time: Saturday, June 06, 2015 6:56:01 PM
. 2015-06-06 18:56:01.475 --------------------------------------------------------------------------
. 2015-06-06 18:56:01.475 Session name: admin@192.168.1.104 (Modified stored session)
. 2015-06-06 18:56:01.475 Host name: 192.168.1.104 (Port: 22)
. 2015-06-06 18:56:01.475 User name: admin (Password: Yes, Key file: No)
. 2015-06-06 18:56:01.475 Tunnel: No
. 2015-06-06 18:56:01.475 Transfer Protocol: SFTP (SCP)
. 2015-06-06 18:56:01.475 Ping type: -, Ping interval: 30 sec; Timeout: 15 sec
. 2015-06-06 18:56:01.475 Proxy: none
. 2015-06-06 18:56:01.476 SSH protocol version: 2; Compression: No
. 2015-06-06 18:56:01.476 Bypass authentication: No
. 2015-06-06 18:56:01.476 Try agent: Yes; Agent forwarding: No; TIS/CryptoCard: No; KI: Yes; GSSAPI: No
. 2015-06-06 18:56:01.476 Ciphers: aes,blowfish,3des,WARN,arcfour,des; Ssh2DES: No
. 2015-06-06 18:56:01.476 SSH Bugs: A,A,A,A,A,A,A,A,A,A
. 2015-06-06 18:56:01.476 SFTP Bugs: A,A
. 2015-06-06 18:56:01.476 Return code variable: Autodetect; Lookup user groups: A
. 2015-06-06 18:56:01.476 Shell: default
. 2015-06-06 18:56:01.476 EOL: 0, UTF: 2
. 2015-06-06 18:56:01.476 Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes
. 2015-06-06 18:56:01.476 LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No
. 2015-06-06 18:56:01.476 Local directory: default, Remote directory: home, Update: Yes, Cache: Yes
. 2015-06-06 18:56:01.476 Cache directory changes: Yes, Permanent: Yes
. 2015-06-06 18:56:01.476 DST mode: 1
. 2015-06-06 18:56:01.476 --------------------------------------------------------------------------
. 2015-06-06 18:56:01.577 Looking up host "192.168.1.104"
. 2015-06-06 18:56:01.577 Connecting to 192.168.1.104 port 22
. 2015-06-06 18:56:01.629 Server version: SSH-2.0-CoreFTP-0.3.3
. 2015-06-06 18:56:01.629 Using SSH protocol version 2
. 2015-06-06 18:56:01.629 We claim version: SSH-2.0-WinSCP_release_5.1.3
. 2015-06-06 18:56:01.634 Using Diffie-Hellman with standard group "group14"
. 2015-06-06 18:56:01.634 Doing Diffie-Hellman key exchange with hash SHA-1
. 2015-06-06 18:56:01.886 Verifying host key rsa2 0x10001,0xc8ddef427f8708473a75b5dbe94a2f83c987e09c60e162080861960220c9071fc746728db9fdf1d2f6893bfe61baa849a395b0663303a72c6460d21a168d8405af092136521bb7182f74d8d550fb28374ae7f72924c7767fc48c9a81fe4a210aab5e926e76e4572849b509825d899bad24a1813e301c4438de4fceca8f457769 with fingerprint ssh-rsa 1024 0d:5f:93:b3:48:9f:5c:60:a3:31:29:c3:38:5f:20:57
. 2015-06-06 18:56:01.939 Host key matches cached key
. 2015-06-06 18:56:01.939 Host key fingerprint is:
. 2015-06-06 18:56:01.939 ssh-rsa 1024 0d:5f:93:b3:48:9f:5c:60:a3:31:29:c3:38:5f:20:57
. 2015-06-06 18:56:01.939 Initialised AES-256 SDCTR client->server encryption
. 2015-06-06 18:56:01.939 Initialised HMAC-SHA1 client->server MAC algorithm
. 2015-06-06 18:56:01.943 Initialised AES-256 SDCTR server->client encryption
. 2015-06-06 18:56:01.943 Initialised HMAC-SHA1 server->client MAC algorithm
! 2015-06-06 18:56:01.948 Using username "admin".
. 2015-06-06 18:56:02.001 Prompt (7, SSH password, , &Password: )
. 2015-06-06 18:56:02.001 Using stored password.
. 2015-06-06 18:56:02.058 Sent password
. 2015-06-06 18:56:02.062 Access granted
. 2015-06-06 18:56:02.067 Opened channel for session
. 2015-06-06 18:56:02.202 Started a shell/command
. 2015-06-06 18:56:02.211 --------------------------------------------------------------------------
. 2015-06-06 18:56:02.211 Using SFTP protocol.
. 2015-06-06 18:56:02.212 Doing startup conversation with host.
> 2015-06-06 18:56:02.266 Type: SSH_FXP_INIT, Size: 5, Number: -1
< 2015-06-06 18:56:02.482 Type: SSH_FXP_VERSION, Size: 5, Number: -1
. 2015-06-06 18:56:02.482 SFTP version 3 negotiated.
. 2015-06-06 18:56:02.482 We believe the server has signed timestamps bug
. 2015-06-06 18:56:02.482 We will use UTF-8 strings for status messages only
. 2015-06-06 18:56:02.519 Getting current directory name.
. 2015-06-06 18:56:02.519 Getting real path for '.'
> 2015-06-06 18:56:02.519 Type: SSH_FXP_REALPATH, Size: 10, Number: 16
< 2015-06-06 18:56:02.524 Type: SSH_FXP_NAME, Size: 23, Number: 16
. 2015-06-06 18:56:02.524 Real path is '/'
. 2015-06-06 18:56:02.669 Listing directory "/".
> 2015-06-06 18:56:02.669 Type: SSH_FXP_OPENDIR, Size: 10, Number: 267
< 2015-06-06 18:56:02.678 Type: SSH_FXP_HANDLE, Size: 22, Number: 267
> 2015-06-06 18:56:02.678 Type: SSH_FXP_READDIR, Size: 22, Number: 524
< 2015-06-06 18:56:02.686 Type: SSH_FXP_NAME, Size: 2773, Number: 524
> 2015-06-06 18:56:02.686 Type: SSH_FXP_READDIR, Size: 22, Number: 780
< 2015-06-06 18:56:02.769 Type: SSH_FXP_STATUS, Size: 28, Number: 780
< 2015-06-06 18:56:02.769 Status code: 1
> 2015-06-06 18:56:02.769 Type: SSH_FXP_CLOSE, Size: 22, Number: 1028
. 2015-06-06 18:56:02.869 Startup conversation with host finished.
. 2015-06-06 18:56:08.791 Copying 1 files/directories to remote directory "/"
. 2015-06-06 18:56:08.791   PrTime: Yes; PrRO: No; Rght: rw-r--r--; PrR: No (No); FnCs: N; RIC: 0100; Resume: S (102400); CalcS: Yes; Mask: *.*
. 2015-06-06 18:56:08.791   TM: B; ClAr: No; CPS: 0; InclM: 
. 2015-06-06 18:56:08.791   AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; *.js; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml
. 2015-06-06 18:56:08.791 File: "C:\test.report"
. 2015-06-06 18:56:08.792 Copying "C:\test.report" to remote directory started.
. 2015-06-06 18:56:08.792 Binary transfer mode selected.
. 2015-06-06 18:56:08.793 Checking existence of file.
> 2015-06-06 18:56:08.793 Type: SSH_FXP_LSTAT, Size: 21, Number: 1287
< 2015-06-06 18:56:08.793 Type: SSH_FXP_STATUS, Size: 24, Number: 1028
. 2015-06-06 18:56:08.793 Discarding reserved response
< 2015-06-06 18:56:08.803 Type: SSH_FXP_STATUS, Size: 29, Number: 1287
< 2015-06-06 18:56:08.803 Status code: 2
. 2015-06-06 18:56:08.803 Checking existence of partially transfered file.
> 2015-06-06 18:56:08.803 Type: SSH_FXP_LSTAT, Size: 30, Number: 1543
< 2015-06-06 18:56:08.806 Type: SSH_FXP_STATUS, Size: 29, Number: 1543
< 2015-06-06 18:56:08.806 Status code: 2
. 2015-06-06 18:56:08.806 Opening remote file.
> 2015-06-06 18:56:08.806 Type: SSH_FXP_OPEN, Size: 46, Number: 1795
< 2015-06-06 18:56:08.809 Type: SSH_FXP_HANDLE, Size: 23, Number: 1795
> 2015-06-06 18:56:08.809 Type: SSH_FXP_WRITE, Size: 4131, Number: 2310
. 2015-06-06 18:56:19.751 506 skipped SSH_FXP_WRITE, SSH_FXP_READ, SSH_FXP_DATA and SSH_FXP_STATUS packets.
> 2015-06-06 18:56:19.751 Type: SSH_FXP_CLOSE, Size: 23, Number: 67588
< 2015-06-06 18:56:19.751 Type: SSH_FXP_STATUS, Size: 24, Number: 66822
< 2015-06-06 18:56:19.751 Status code: 0
< 2015-06-06 18:56:19.759 Type: SSH_FXP_STATUS, Size: 24, Number: 67078
< 2015-06-06 18:56:19.762 Type: SSH_FXP_STATUS, Size: 24, Number: 67334
< 2015-06-06 18:56:19.978 Type: SSH_FXP_STATUS, Size: 24, Number: 67588
< 2015-06-06 18:56:19.978 Status code: 0
> 2015-06-06 18:56:19.978 Type: SSH_FXP_RENAME, Size: 46, Number: 67858
< 2015-06-06 18:56:19.982 Type: SSH_FXP_STATUS, Size: 24, Number: 67858
< 2015-06-06 18:56:19.983 Status code: 0
> 2015-06-06 18:56:19.983 Type: SSH_FXP_SETSTAT, Size: 33, Number: 2057
< 2015-06-06 18:56:19.986 Type: SSH_FXP_STATUS, Size: 24, Number: 2057
< 2015-06-06 18:56:19.986 Status code: 0
. 2015-06-06 18:56:19.987 Listing directory "/".
> 2015-06-06 18:56:19.987 Type: SSH_FXP_OPENDIR, Size: 10, Number: 68107
< 2015-06-06 18:56:19.990 Type: SSH_FXP_HANDLE, Size: 22, Number: 68107
> 2015-06-06 18:56:19.991 Type: SSH_FXP_READDIR, Size: 22, Number: 68364
< 2015-06-06 18:56:20.001 Type: SSH_FXP_NAME, Size: 2890, Number: 68364
> 2015-06-06 18:56:20.001 Type: SSH_FXP_READDIR, Size: 22, Number: 68620
< 2015-06-06 18:56:20.006 Type: SSH_FXP_STATUS, Size: 28, Number: 68620
< 2015-06-06 18:56:20.006 Status code: 1
> 2015-06-06 18:56:20.007 Type: SSH_FXP_CLOSE, Size: 22, Number: 68868
. 2015-06-06 18:56:25.033 Closing connection.
. 2015-06-06 18:56:25.033 Sending special code: 12
. 2015-06-06 18:56:25.033 Sent EOF message

UPDATE 2

it seems the problem is present from version 5.2.5 and above, however I noticed during my tests that it only occured with CoreFTP server for me, I tested it with Solarwind FTP server and everything worked smoothly, actually the newer versions were faster with the latter. then I tested with Psftp 0.64 client and CoreFTP but it didn't had the problem.

  • Is the upload CPU-bound (i.e. 1 core running at 100% all the time)? – Eugen Rieck Jun 5 '15 at 14:02
  • no, my cpu usage is minimal on both versions (under 10% on all cores) – user3473830 Jun 5 '15 at 14:05
  • @MartinPrikryl ,updated the question with logs, just one thing I didn't have access to the work machine, so I tested it on my own computer, the difference on my test wasn't that huge (about 2.5X slower in newer version compared to 10X at work) but still the problem happened. – user3473830 Jun 6 '15 at 15:03
  • Thanks. Can you try to find out what version introduced the difference? (Start with trying 5.5.6 and 5.1.8). Once you do, please post log file on Debug-1 level. – Martin Prikryl Jun 6 '15 at 18:36
  • @MartinPrikryl I tested the versions as you said and got the logs and updated the question accordingly, but the logs are huge and I can't post them here, do you want me to open a bug report in the WinSCP forum with the same title and information including the logs? – user3473830 Jun 7 '15 at 8:45

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