Good news people
You CAN make the editor run at a comfortable speed, if you run it with Advanced Game Loader, a small prog I used earlier to slow down the original Dungeon Keeper and Deeper Dungeons. Works well with the editor as well. You can find it here:
http://www.sven-of-nine.de/site/doku.php/downloads
I run it at 20% speed, works fine for me, but you may want it running at a different speed depending on your pc and how you like it.
It comes with a good help file, but I'll be happy to assist if you want me to.
Happy editing to you