Its more about the type of defrag you do. Auslogic probably does a fairly "shallow" defrag, and hence it can do it much quicker. You might then be backing up with UD4 with a similar defrag method that is complimentary. Regardless of which defragger you use, how "fast" or "slow" they are is probably irrelevant as they should all be roughly the same speed if you are performing a similar style defrag. If you use UD4 in consolidate mode for example, this is one of the deeper defrag methods that will deliver best results and greatly reduce seek times (and hence have the effect of speeding up file read/writes) but because it has to move a lot more files around to achieve this, it means its one of the slowest too.
Ideally, you would run consolidate mode all the time, but unless you have it set up as a scheduled task to run at least every 2-3 days, it will take an age to defrag a badly fragmented drive using this method. Where UD4 excels is that it offers methods of defragmentation and defrag logic that most others do not. I.e. the ability to place individual files or folders on parts of the disk platter for best performance (or for archiving), and the actual disc display in UD4 allows you to see where files are actually located on your hard disk, something which only UD4 offers (as far as I know).
It is also flexible for both regular users (using the Auto mode) or for Power users who know what is going on and how to set things up so the defrag delivers the absolute best results based on your file access needs. It is really quite interesting how it all works, and I really only scratched the surface in that article (well, maybe I peeled a couple layers off the knowledge onion anyway).
Ultimate Defrag 4 available here > http://www.pcaviator...01&cat=0&page=1