I changed it so there were 100 dungeons.
the game crashed as soon as I tried generating the world :(
Got 3FPS on my i7-4770K and GTX 770 rig - that should put that in perspective.
Of course, I was running with only 1GB of RAM, I hadn't changed it yet to allocate 8 of my 16GB.
EDIT: Changed it to 8GB fixed it, but still get lag spurts when generating.