DVDXCopy Speed

The first software I ever used was DVDXCopy Platinum, but recently I’ve been using DVD Shrink to compress. How does DVDXCopy rip, compress, and burn a movie in only 45 minutes on a 1GHz computer with only 318 MB of memory? While it takes DVD Shrink 2 hours or more to compress when using Deep Analyses? Even without Deep Analyses is takes it more time to compress than it takes DVDXCopy to go thru the entire process.