I used it five years ago with a more powerful PC than I have right now, with great success. This program loads with a default processor priority of "Low" but I change that to "High" and my system moves quicker than it did without it and this system is cheap.
Much like others, your system ends up slowing down and not running correctly with it's usage. This is no exception. It doesn't like it when you use something like Gimp or a 3-d app, or something that uses extra resources. I guess another way to explain my experience is Fast Defrag was fighting for control, not actually working in harmony with my system. I ended up doing 3 restarts due to a non responsive OS. A noticeable difference when transferring large files over my home lan, they became slow or sluggish if you will. That said, what good is it? I have gotten rid of this plague and now my PC is healthy running again.
In a heavy used system with only 512 MB of memory Fast Defrag tries very (maybe too) hard to balance between memory and cache. It frees lots of mem on its fly indeed, but it panicked and lost its balance completely when a very large file was zipped for backup. It crashed my system. I had to look for a reset button to reclaim the system, repair the damage and take Fast Defrag off-line for ever.
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