I’ve been working a lot with DW MX 2004 since the updater has been released, and there is no doubt: it’s much faster. Faster to launch and connecting to the server.
There is also a little detail which has also been corrected: the “document panel” remembers its last position when you open DW. Not doing so was really annoying!

The first thing I used to do after opening DW was repositioning the panel. Now I can start working right away!