Why are some operations so brutally slow?

If I have updated to QuTS of course I have.

Edit: It’s possible the slow speeds I’m seeing right now are just due to the types of files being transferred - small files, photographs, etc. I know transferring a lot of small files can actually be much slower than transferring large ones just because of the start/stop nature of the transfer process. That’s why sometimes it’s more efficient to ZIP things before transferring…