currently playing the modpack craftorio(1.6.1), running neo-forge 21.7.2.

the issue starts when I attempt to go inside the maze dungeon, outside, the fps is just fine.

i suspect it has something to do with the following mods I added myself:
distant horizons (notably I did turn off rendering and try to set the distance to 0)
everlasting abilities (made sure i took away any ability that affected other creatures before entering)
Pickletweaks (nothing tried)
pufferfish skills/attributes (nothing tried)
default skill tree (related to pufferfish skills)
cyaneryth mob tree (also related to pufferfish)
overflowing bars

in my mind the most likely culprit is pufferfish skills but i dont know how to go into any sort of debug mode for this mod or view what is causing tps lag in minecraft.

There're many block entites in the maze (Lunar Vine Block), maybe just use some block entity related optimization mod? The structure will be overhauled in a future update, it'll be smaller so these laggy vines will be less too.

You can send a spark log here

Try update to the latest 0.1.18. The structure has been reworked with its size decreased. (Only works if you generate a new world)