From the MWD ReadMe file FAQs. I need to get this on the web somewhere...

(Q) Walk Designer takes FOREVER to load!

(A) Decompress the walk blends with the Python Script provided with Poser 5. Walk
designer loads much faster when it doesn't have to decompress the files first.
From the File menu select Run Python Script.... Browse the Poser folder and find
the script named, "uncompressPoserFiles.py" and open it. Type in the path to
your pose/WalkDesigner folder. (If you don't do this it will decompress all your
Poser library files) Be sure to check the "Delete Original Files"
option. and Click OK. Walk Designer should load in less than half the time now.