Recurrent Complex loaded a new chunk [834, -1406] in dimension 2 (overworld) while populating chunk [834, -1407], causing cascading worldgen lag.

Recurrent Complex loaded a new chunk [833, -1405] in dimension 2 (overworld) while populating chunk [834, -1406], causing cascading worldgen lag.

Recurrent Complex loaded a new chunk [834, -1405] in dimension 2 (overworld) while populating chunk [833, -1405], causing cascading worldgen lag.

and so on.

no clue why this is a thing

He is not lining structures in a single chunk.

I am having the same issue.

Same issue in 1.12.2. After reading Investigating extreme Worldgen lag on Reddit, I checked, and all the RC structures do seem to be centered pretty solidly on the intersections of chunks. so using the +8 +8 offset would help a lot, as most of the structures fit in a single chunk if placed at or near the center to start with.

Yes, I am lining the structures correctly. The issue is unfortunately more complex than that - though I have a solution.

Either way - Duplicate of #155. I recommend pushing down the structureSpawnChance and / or tree decoration replacement chance down in the config for now.