Slow file transfer for many small files using FTP

WinSCP version 5.1.6

When transferring many small files the transfer speed is 4–5 files per second at most. Files size is about 250 bytes. When doing the same test with SFTP to the same host I get to 20–25 files /sec.

The SFTP speed is fine. Can the FTP transfer do it at the same speed?

I'd expect FTP to be slower as it has to open new TCP/IP connection for each file. Do you experience a better performance with other FTP clients than with WinSCP for small files?

OK, so I can understand why FTP is slower than SFTP.

I compared WinSCP with FileZilla using FTP with small files: FileZilla is about 2x faster than WinSCP doing 8-9 files/sec.
Getting WinSCP up to this speed would be nice, but the current speed is no show stopper :wink:

Can you attach comparable logs both using WinSCP and FileZilla?

I did the same load test with FileZilla instead of WinSCP, transferring 160 files of 276 bytes each. The speed is 17 sec for 160 files, about 9 files/sec. WinSCP did 4–5 files/sec.
I included the log file.
The WinSCP log file is in my post of 20 sep.

The FileZilla log file suggests that it is setting up two connections in parallel. Maybe that is a clue?

tomb wrote:

The Filezilla log file suggests that it is setting up two connections in parallel. Maybe that is a clue?

You can do the same with WinSCP:
https://winscp.net/eng/docs/transfer_queue

Can I do that in scripts too? By using -rawsettings option?

@tomb: No. But you can run multiple scripts in parallel.

Have the same issue.
WinSCP uploading and downloading large amount of files ridiculously slowly. Even if I activate multiple connections WinSCP behave the same slowly, but in parallel multiple streams.
Installed FileZilla, it seems it has 2 multiple connection by default, but the main thing – how fast filenames blinking in the transfer window, I can't read filenames. While in WinSCP filenames changing so slowly.
Filezilla is like firing bursts. WinSCP is like firing single shots. Have no idea of ​​such behavior of WinSCP.

@copenhagen72: Please post logs of comparable transfers both from WinSCP and FileZilla.