They tried to add compression, but as you remember the first DD version, saving was extremely slow.
There is a lot to save and they add lots of redundant stuff, to make sure you can keep your saves if a new patch gets released.
I'de rather have a 20megs save than 5 megs and half an hour to save a game <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />
