From my Laptop, I open a network Folder, I cut a large file , and I want to paste it over existing file, in another Network folder.
I get the attached JPG , I must wait till the green progress bar will terminate before I push the Retry button.
Does it only happen with (large) archives? Try disabling your antivirus scanner to see if it scanning them is what's causing the unusual delay.
(It's also possible it is the antivirus on the server side.)