Hello 👋
So the better portals worldgen seem to create heavy lag spikes when it's mixed up with modded content. Here is a lag spike I captured using Spark :
https://spark.lucko.me/cXzmzcQmN4

Here is my latest.log file
latest.log

I'm using Minecraft 1.16.5 / Forge 36.2.23 / BetterPortals-1.16.4-0.3.9

Love your mods btw 👍 thank you