Memory Leaks when generating worlds

When pre-generating single player worlds using chunky or distant horizons it takes up so much memory and will eventually crash even with 4-20gb of ram allocated (ddr4 @3600mhz).

Now I am using a world generation mod called Big Globe, which gives super tall mountains and goes very deep, Which definitely does not help.

How can I make it so I don’t run out of memory every time I want to generate a world? if i pre generate the world without DH it seems like dh never builds the LOD when I join with it.
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