Time stamps. When you go out of the chunk and back in it optimizingly simulates the amount of ticks of furnaces, tile entities, crops and certain other blocks when your out of the chunk. And if seasons get added simulates seasons.
It needs to be optimized like say 10,000 ticks or so you have been gone so it does the math on how much of the furnace the thing has gone through instantly and has the remainder there. Aka a new interface for blocks/tiles to implement.
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