Boosting CPS + help

I was hoping to ask for a little bit of friendly advice if anyone else has some other settings they use to boost the amount of chunks they're pregenerating. Second thing is that I tested it once on a random seed with JJTTM, but when I left the game and rejoined it to see how it would look the entire world was gone, has this happened to anyone else? I believe what he problem was that the distance I was trying to render but I'm not 100% sure if that's right. Any advice would be really nice since I have no idea how this stuff works.
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