Hi cheewongken, I am not a computer guru by any means. I have always used the defragmenter that came with Windows until recently. I tried defraggler and it was ok. I then tried the Auslogics disk defrag and to me, it made my laptop run smoother and quicker. I don't have any timers to prove any kind of speed increase, I'm just going by the feel of my machine. I am not a TV watcher, so my spare time is spent on my computers, and I tend to notice any kind of changes to my machines. At this point, I believe you are using the best free one on the market. Have a great day !!!