I have an in-house webdav server in the form of Nextcloud on a Pi. It is added to Dolphin as a network location. When copying files to the Pi, the notification shows not the network transfer rate, but something else. If I'm transferring one large file, it reaches 100% in seconds and pauses until the actual upload completes, whereupon the notification disappears. If I am transferring several files, it pauses between each file. The smaller the file, the less apparent the pause, of course. I sometimes use Cinnamon, so I've noticed more accurate transfer information there, so I think it is a KDE thing. I wonder if it is reporting file transfer speeds from storage to RAM (and with 16GB RAM, there's not a single file I would transfer to my Pi that couldn't sit in RAM with room to spare).

I use no other form of network share at home, so I'm unsure if ftp or smb would give the same result.

And a quirk of KDE, it also warns me this when I connect to my Pi:
You are about to log in to the site "example.com" with the username "dave", but the website does not require authentication. This may be an attempt to trick you. Is "example.com" the site you want to visit.

In my case, example.com is one of my subdomains, pointed at my home IP address so I can access my Pi anywhere.

Can I disable that, since I'm prompted every time I launch Dolphin and connect to my Pi?