rsync --progress isn't very good, which is why I worded it that way. If you use rsync --partial it has to rescan the source and destination directories again.

rsync --progress isn't very good, which is why I worded it that way. If you use rsync --partial it has to rescan the source and destination directories again. All it does is let you resume transfers, and for some of us, transfers are not the slow part.