The version 2.1.4 of Thaumic Augmentation mod linked bellow causes cascading worldgen lag, by itself it wouldn't be that bad but in any sizeable modpack it adds on quite a bit of cascading worldgen lag. I have also included a link explaing exactly what that is and how to go about fixing it. Example setting and offset or flags when structures are spawned partially in a chunk and when adjesent chunks load it reads it and finishes generating the structure.

https://www.reddit.com/r/feedthebeast/comments/5x0twz/investigating_extreme_worldgen_lag/

https://www.curseforge.com/minecraft/mc-mods/thaumic-augmentation/files/3425225

Couple things I need to know:

• Is this happening in the Emptiness, or another dimension
• Does this occur with just Thaumic Augmentation and it's dependencies

I am familiar with cascading worldgen and explicitly tried to make that not happen, so I need some more details about where it might be going wrong.

It doesn't happen very often so your work to make it not seems to be good, but it still does happen sometimes, I'm just trying to report this to all the mods creators that I use in my pack. A few have already looked into or fixed some of their cascading worldgen lag issues.

It happens in the normal overworld, and can be triggered by just generating chunks normally or via pregen mod.

Here is a link to the pack I have made.
https://www.technicpack.net/modpack/zelkyns-modded-mc.1878561