I'm using the latest version 2.10.413 on Windows 64 bit and I am defragging a RAID-0 disk of 2 TB with minimal fragmentation. It starts OK - fast and all but then 3 hours later it gets really, really slow and the ETA for completion says > 1 day. I've been observing similar behaviour for a long time with previous versions (even before I had a RAID array so I don't think it's related) but finally decided to report this. Ideas?