The order is: -Main thread loads rehash chunk -Async thread does rehash chunk swap and starts loading the glass chunk. (Async glass chunk loading takes a lot of time, because glass chunk has 16 chunk sections + savestate books) -Main thread starts loading stall chunk (16 chunk sections + a little bit less savestate books than the glass chunk has) -Main thread finishes loading stall chunk. -Main thread starts falling block tile ticks. -Async thread finishes loading glass chunk.