Version:           4.5 (using KDE 4.5.3) 
OS:                Linux

When copying files, before kio copies a single byte of data, it always scans through every single folder first.  This is fine when dealing with a small numbers of files and folders.  However, when dealing with large numbers of files and folders it has a massive impact on the length of the operation.  It can take hours to scan through every folder, and while that scan is happening no data is being transferred.  It is almost like doing the whole copy twice, once to scan through every file and folder, then a second time to actually copy them.

Reproducible: Always