Well, as far as a slow defrag process goes, here is my story.
I am an update freak so I always keep software I use at its newest version. When updating from version 2.02 to 2.03 I noticed a dramatic decrease in defrag performance. So I figured something must have changed either in Defraggler itself or in my system. Not being able to figure out something substantial for the 2.03 changelog and my system remaining pretty much the same, I went back to version 2.02 and lo and behold defrag performance was back to what it used to be.
Seeing that the original post is dated April 28, you have surely being using a 2.02+ version of Defraggler. My suggestion would be to download version 2.02.253 and try it out, comparing defrag speed. You can find earlier versions at Filehippo's Defraggler page.
Btw, I am not really sure if I should report this as a bug or not, or if developers need any more information about my system or anything, since I don't know how widespread this drop in performance is. It may well have been just an issue with Defraggler and my system. I would gladly provide info if it would help though.