The 21w06a snapshot was recently released, in which a new generation was added and the height of the world was increased, including chunks that were 16x16x256, at the moment 16x16x384, but this is not the most important thing, many mobs appear in these caves and caves themselves because of this, FPS drawdowns begin , my friends with weak laptops generally say that they cannot play on a new snapshot, just plus cubic chunks is optimization and load distribution around the player, similar to what you could see in the Cubic Chunks mod. If you want cubic chunks to be added to the game, please vote for this idea. 

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