It's mostly the size of the image, 1920 x 1080. My P4 HT sputters and coughs with large render sizes. There are also lots of displacements. It's hard to get scale in this one. I did not add anything that shows scale. The tall peaks are over 4000 meters.
Here is the tgd. I think I picked the right one. November has been productive, and I do not name everything as I should.