Hi,

I’ve been using KDE (on OpenSUSE Tumbleweed) for the better part of the last three weeks and there’s a lot I love about it. However, there is on issue that I cannot figure out or understand.

KDE is SO slow when I do large file transfers. Like it drops from 145mbps to between 2-9mbps. This seems to be happening when files are larger (maybe 1GB+). I had read that it was an issue/bug some time ago with Dolphin but that Krusader didn’t have this issue. Something about Dolphin trying to keep the entire large file in memory at once, rather than just the part that’s currently being transferred. However, Krusader has the exact same issue. And this is years later from the old threads I found. It makes moving data minimum of 10x slower. I’m really falling for KDE and there’s so much I love about it. Why is it so terrible on file transfer and is there anything that can be done about it - short of switching to another distro? It’s just too slow for these transfers. Are others having this issue? I have it in Tumbleweed, and also when I’ve used KDE live (USB) distros, too. Same thing. Any thoughts would be really helpful. Thanks so much in advance!

You leave us to speculate. Can you elaborate a bit more? Which file transfer mechanism are you referring to? Local, ftp, sftp, nfs, samba....?

Transfers between SSDs? Harddisks? Network? ...

I apologize, I should have thought to be more specific.

The file transfers are between two USB 3.0 HDDs. (I’ve have several, all of them are similar in speed, it’s not an issue with the drives.) This is only with large files of approx 500mb-1GB is larger. Generally, this size file transfer speeds are between 115mbps to 150mbps when using XFCE, Gnome, Cinnamon. When using KDE, it starts off for a second or two at 115mbps-150mbps then they plummet to between 2-9mbps.

This happens when using either Dolphin or Krusader. I read about a bug from long ago where this was an issue because Dolphin would try to put the entire large file in memory at once rather than only putting the piece of the file currently being transferred. Some said Krusader was faster but that wasn’t my experience.

This is not limited to one distro with KDE. I’ve tried several (OpenSUSE, PCLOS, Manjaro, etc) all with the same outcome.

You should probably check KDE bug reports then
https://community.kde.org/Guidelines...s/Bug_triaging
https://bugs.kde.org/

A workaround might be to use CLI copying command (or similar).

Okay, that doesn't sound like overrunning the DRAM caches of the drives then. I use USB drives for backups only and there I don't have that problem, sorry to be of no further help.