Only one player used a Chiseled Bit Bag with chiseled marble pieces and it caused huge performance issues for some reason:

chiselsandbits-14.18
forge-1.12.2-14.23.4.2705-universal

Update: The player had 5 bags and all of them had this content: , once the player started placing them the issue started.

Seems rather strange that forge capabilities are so heavy hitting on bits which don't have a capability... I'll need to do some testing on my end, it seems likely that I'll have to rethink how that logic works.

I noticed in the past months that multiple other mods are having performance issues with forge capabilities.

Should be fixed in 14.21, thanks for the profiles and tracking down the source, made it super easy to reproduce and fix it.

Thanks!