Game lag

[ghost]

[22:43:17] [Worker-Main6/WARN]: Empty or non-existent pool: dungeons_arise:underworld/foundry/foundry_corridor_gears
logs
https://t.wss.ink/f/a79x7nncw59
game lag, the game gets stuck when repeated.

[TigerWalts]

I've come across this problem too, on 2 ATM8 modpack servers.

One of them I managed to do some profiling and the bulk of the time was spent in Datafixers. The DataVersion in the structure files I looked at is 2586, which is for Minecraft 1.16.5.

I suspect that the Datafixers are being run on newer versions of MInecraft when these structures are being placed. I also suspect that when each structure jigsaw part is fixed, the result is not being cached and so for large structures the processing time can explode.