I run into the issue sometimes cross-volume, where the file gets extracted into a temporary directory then has to be copied to the actual destination, into e.g. a network volume or second hard disk.
If it's moving it to a different drive/partition it'll have to copy it again
Moving many (small) files can also be quite slow
Back when I used Winzip/7zip, they didn't move files: they copied files. When you're working with files measured in gigabytes, the speedup is quite noticeable.
depends on the move operation.
1 file you would not notice it. Thousands it would add up. Across 2 physical drives you may also notice it if the file is big enough.