Fast and reliable UltraDefrag does everything I want it to do - and more. It is fast, reliable and stable I can only reecommend it.

Virtual Machines (Windows 10, Ubuntu) work more faster UltraDefrag 10 works well on Windows 11 22H2 beta, also with Hyper-V Virtual Machines. I use SSD. Virtual Machines (Windows 10, Ubuntu) work more faster after the defragment of vhdx. I strongly recommend this useful software. Thank you so much for your products!

Over the past few years Over the past few years, I tested a variety of defrag software, some of which are among the big names in the industry. There is an analysis tool available in Ultimate Defrag which gives a numerical value of the degree to which a defrag job has optimized a hard drive. So far, and among a whole variety of software I gave a try, Ultra Defrag achieved the highest score after a full boot-time optimization (with file arrangement based on time of access in ascending order while keeping the other default settings), which was easily noticeable in the speed of file and application opening as well. The same excellent performance can be maintained by periodic quick optimizations after a full boot-time job, which can be scheduled as an automatic defrag.

Non-existent customer support Non-existent customer support - NO RESPONSE!!! Emailed on June 17, an issue with UltraDefrag along with screenshots and diagnostic information Follow-up on July 4th Have paid for multiple versions over the years but this one was my last since I suspect the company is going out of business. All I get is automated emails saying: "Dear customer, Thank you for contacting us! We will review your request and respond to you within 3 business days." Not true!

Very good software Since it was open source has been the best defragmenter. It's also usable as a portable software. Now it's a commercial software, but nothing has changed.