Serious performance problems/

[Aleeee12]

neoforge 1.21.1
neo 21.1.219
Dungeon Difficulty 3.6.10+1.21.1

logs
https://spark.lucko.me/Y39CPgYRUv

captrues

[ZsoltMolnarrr]

Unable to reproduce this issue in native Fabric or NeoForge installations.

Sinytra Connector can cause weird issues as such.

Feel free to reopen the issue, if you manage to reproduce it, without Sinytra Connector.

[ZsoltMolnarrr]

Seems like the game is trying to process an outdated structure NBT file.

[Aleeee12]

But is there any proof that it's sinytra?

[Aleeee12]

Yes, I don't know how to identify NBT; I'll look for a solution.