The world gets frozen on generating world when trying to open a world. ):

I'm doing this channel where I turn parts of the nether into heaven, which has gain quite the following. So, whenever I went to open my world again, it sort of froze. I say sort of because the background stopped moving, and the green bar stayed filled up, but the messages were still changing. I like it sit for a couple minutes, and I've changed my setting, but nothing seems to work. Please fix this! ~Lemon <3