Copying Large Numbers of Files Over a Network in Linux

Linux and Window desktops are ill-suited to copying thousands or millions of files over a network. I don't know why. It's a weak spot in all desktop GUI's. I know that KDE's file manager, Dolphin, does nothing but spin its wheels when I try to copy much over a thousand files. I think KDE goes crazy just at the thought of so many files. You expect me to do all that work? For what you're paying me? Hmph! I have found that the easiest way to copy files over a network is to archive them into a single file and then copy that single file across.