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https://stackoverflow.com/questions/214714/mutable-vs-immutable-objects Doing lots of new operators in a short time will create lots of garbage which can stress the garbage collector if you do it too much. Its the kind of thing you might not see in development with only 1 user, but will be more of a problem as you try to scale up.

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I think your problem is your iteration logic is wrong. You need to reset after each inner loop. Your logic as it stands moves south 3, then up 1 then south 3 again, then up 1, you see the problem?

To take advantage of the mutable you want code more like: BlockPos.MutableBlockPos blockMutable = new BlockPos.MutableBlockPos(x, y, z); for(int i = 0; i < 3; i++) { for(int ii = 0; ii < 3; ii++){ for(int iii = 0; iii < 3; iii++){ level.removeBlock(blockMutable, true); blockMutable.move(Direction.SOUTH); } blockMutable.move(Direction.UP); } blockMutable.move(Direction.EAST); } If you look at the BlockPos class there are static methods such as betweenClosed() that let you create iterables or streams for different shapes. These methods use a MutableBlockPos internally.