I am having trouble with SFTP transfers in Directory Opus (v12.3, Win10 64) being very slow. Copying the same 25GB file to/from the same destination drives across a gigabit LAN, from Windows host to Ubuntu server gave me these results Copying a 24.4GB file to/from Windows/Ubuntu From To …

SFTP download speed was sped up quite a lot since initial reports. I think upload may still be a little slow, although it has not been looked at in detail yet. What you're seeing seems different, though. That amount of speed difference is much more than we observe in our own testing. (Saying that, …

I can confirm similar slow SFTP speeds as citlee on the current version: 12.10, x64 I configured a Samba server on the remote Linux system after I encountered slow SFTP speeds. DO download speeds from the Linux server running Samba: 80MB/s DO download speeds from the same Linux server over SFTP: …

I experience this with a fresh install of dopus towards a linux server. Uploads seems to stop at just above 4MB/s Has there been any development in this matter? WinSCP achives 30MB/s across the same link.

Just tried sftp over gbit lan and noticed a big change from major 12 to 13 to the worse! filezilla gives me this [image] and dop gives me this [image] smaller file less performance dops [image] same files with filezilla [image]

We'll be replacing the SFTP library with a new one as the first big piece of work after we finish working through the initial feedback on Opus 13.

This is still a problem. I just purchased this software and the SFTP support was a significant consideration in that decision. Filezilla reports ~100MBps read/write to my server, but I get ~10MBps with Directory Opus. Is there a solution to this? If not, then I would like to request a refund on …

[image] Which SSH private key format should be used with DO 13.6? speech_balloonHelp & Support New SFTP code should be ready fairly soon now.

Understood. Thank you for the prompt response. If it is close to production-ready then I do not need a refund.

Hello Hardkorn. How close is the bugfix for slow SFTP transfers to being completed? From the previous response I assumed a timeline of less than 6 months and was hoping we could expect to see it happening this or next month.

Can support please provide a timeline for this bugfix? It has been claimed to be in development for a significant amount of time (6+ years). I have paid for a product that is not working as intended and was told that it was nearing resolution which led me to avoid asking for a refund. I transfer …

SFTP file transfers slow

Help & Support

Hardkorn February 14, 2026, 8:23pm 8