I have a world that is around 500 megabytes, and I made a copy of it in creative to explore. Before making this copy, I could access this world, but the time it took to open it was still quite slow. Now, having tried to open this second copy of the world (even with graphics effects reduced significantly) I have experienced loading times upwards of 10 minutes, and no success in joining the world. The “building terrain” message seems to be the final stage it is stuck on before the screen freezes. Additionally, the progress bar is practically full when this frozen screen is met. To elaborate, this is the original model of Xbox One, I have no other apps or games open, my network is stable (I tried going offline and it did not help, other games on my console work just fine, the world I am trying to access was originally an older world that had added the new height and depth expansions with the cave update, and the last screen I was at before I left the world was the death screen after I was killed my the Warden, and I turned it on peaceful and quit.