Hi
World creation takes quit a lot of time on my computer. Which always makes me somewhat nervous, is it just taking long or has the game crashed. For that reason i suggest either placing a progress bar, some animation, or a line of text informing you of what the map script is doing (eg, "Generating landmasses". "Placing mountains"). At least add something to indicate that the game hasn't stopped working.
Hope to be of help,
Wieke.
