Gradually removing lots of blocks, RAM getting filled and not cleared

[AwesomeDomi]

I am making a TNT mod, and to make my extremely powerful TNT possible to blow up on most devices, I made my code remove a lower amount of blocks multiple times instead of everything at once, however I do not know how to prevent the RAM from constantly getting filled up. For example: my current strongest explosion can destroy 5B blocks when I allocate all 80GB of RAM, but even when I pause it (which I implemented), the RAM never starts clearing out, even when I leave the world it stays, and does not clear until I exit the game.
I use world.setBlock(new BlockPos(realx, realy, realz), Blocks.AIR.defaultBlockState(), 3); for my block removal.

How can I fix this? (Forge 1.19.2)

Edited November 10, 2023 by AwesomeDomi