Defraggler is useless i think. I have just uninstalled it. in Defraggler Discussion Posted March 12 · Report reply I though other programs were better than standard Windows 10 defrag tool. So I have given a chance to Defraggler. My main drive is 1 TB WD10EZEX HDD. I don't have SSD right now. First of all, volume shadow copy and other settings like that, increase defrag time too much. Okay, I have disabled them and defrag time improved but it is still much slower than Windows 10 Home standard defrag tool. Probably it defrags larger files too. I have tried fast defrag options and slow defrag problem was gone. But HDD performance reduced drastically either way. No matter what settings I have tried, I couldn't recover my HDD performance. The only solution is using standart defrag tool of Windows OS. After Defraggler defrag --> Crystal mark calculated 90-100 MB sequential reading speed. After Windows defrag --> Crystal mark calculated >160 MB sequential reading speed. Another problem is, moving larger files to the slowest section of the HDD. At first it is a good idea but unfortunately Windows started writing all new large files to the slowest section. Games and programs are loading slowly right now. I always move larger files with Windows standard defrag tool as a result. MEH. (Defragging empty space etc. didn't work for me.) So, I have removed Defraggler and will not use any other defrag programs like this. Standard windows defrag is the best option because Microsoft knows best about their operating system, not third party developers right ?