Terribly slow transfers :: Support Forum

mh12 Guest

Terribly slow transfers

2025-05-29 07:15

This is my ongoing problem throughout Windows versions (10, 11 always with latest patches) and WinSCP versions (always latest). I have latest NIC driver and firmware.

I have slow transfers (upload and download is always approx. 1.8 MB/s).
Speed is always set to Unlimited.

I tested with FileZilla (approx. 80 MB/s with 800 MB file) and SecureCRT (approx. 30 MB/s with 30 MB file).
I tried to disable Optimize connection buffer size with no effect.

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 42,146
Location:: Prague, Czechia

Re: Terribly slow transfers

2025-05-29

Please attach a full session log file showing the problem (using the latest version of WinSCP).

To generate the session log file, enable logging, log in to your server and do the operation and only the operation that causes the error. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

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