[Nightly build, just downloaded. Windows 10 64bit]
I'm just generating a new map of over 600x600 km, default settings for industries, rivers etc., just some adjustments to map height and water levels. I still have lots of free memory (~2GB), CPUs are hardly busy and it's been over 3/4 of an hour without any movement in the progress bar. The blue bar is still at <5%. The process still seems to be alive, but I don't remember that kind of waiting time, even creating a 400x400km map on my old laptop (when max. map size was fixed at 4096² tiles I think). Are there any known problems with the map generator?