I work on a Mac Mini with a main ssd so when I upgraded my Mini to High Sierra the upgrade changed my ssd from HFS+ to APFS. I have an NAS attached to the system for use as external storage and those drives are formatted at NTFS as required by the NAS enclosure. I also have an external usb3 drive attached to the Mini for use in storing my digital photos and that drive is formatted as HFS+. I have never had a problem copying to and from any of these those drives until the upgrade to High Sierra.
Yesterday I tried to copy a 3+GB file from the NAS to my external usb3 ssd and was told that the copy would take an estimated 4 hours. I rebooted and tried again and was told that it would take 6 hours. I then tried to copy it to my main ssd instead and was told that it would take 3 hours. Prior to the upgrade to High Sierra I made a Carbon Copy Cloner clone of the Sierra system, so I booted that up and tried again and was told that the transfer would take 2 minutes.
So with Sierra and NTFS For The Mac 14 the copy took 2 minutes. With High Sierra and NTFS For The Mac 15 the estimated time was 3-6 hours, so something is very wrong. Has anyone seen anything like this? I am just about ready to restore my system to Sierra because the copy times are just too long. Any help would be appreciated.