Hello, are you aware of this bug ?
Moving many files in Nautilus often but not always takes a very long time to complete
https://bugzilla.gnome.org/show_bug.cgi?id=757747
https://bugzilla.redhat.com/show_bug.cgi?id=1321684
It's a quite annoying one and of course it will be great if it can be fixed.
Thanks !