SFTP og FTP suddenly getting throttled / slow

Hi!
I was behind in updating Dopus, and got up to 13.12 this christmas (from 13.8 or something).
Working a lot with files on ftp-sites in my work I use Sftp to download and upload sometimes bigg files using Dopus. This has worked fine since dous 8 days.
Suddenly now, Dopus is throttled down to 2,5mb/s on all files, even with just FTP enabled.
When using the program WinSCP on the same machine, with the same settings for SFTP, it gets 38MB/s, just like Dopus used to do earlier in desember.
Is it something I could have done in the settings in Dopus? Has something happened in the last few updates of Opus?
I really want to continue using Dopus for my SFTP-work, so I am really hoping there is something to be done with this.
Note: I have tried starting more threads and not queing up for three files in dopus. Every file gets 2,5mb/s at the same time. When doing the same in WinSCP every fine gets 32mb/s, so it looks like Dopus throttles every filetransfer at 2,5MB/s.

There's a speed limiter in the FTP settings. Maybe you turned that on. Other than that, the way FTP works hasn't changed in a very long time.

I have not turned on the speed limiter, doublechecked right now.
Its really weird, since it has worked like a charm for years...