Hi.
I'm Modpack Author of A.C.P and currently working on improving the server performance for the modpack, currently Natures Aura is the biggest taker of CPU useage i managed to reduces the intake from 15% down to 10% by tweaking particle emmit . Both Lagggoogles and Spark indentify
de.ellpeck.naturesaura.block.BlockSpawnLamp.onSpawn() method as the cullprint,
We couldnt currently pin it down any further than that.
Can you help us a bit to tweak the performance, while the server certainly can handle it, it still a bit concerning that a single mod causes this much server load (in a 252 big modpack).

Yeea, that was kind of to be expected. Since the spawn lamp has a huge possible area, it also checks that huge area to see if any spawn lamps are nearby that would cancel the spawn.
This is a pretty easy fix, though.

A easy fix would be highly appreciated ^^if you still need anything from me i can provide (logs etc.) just let me know, or if i can fix this on my end.

Note that an update was released for the 1.12 version of the mod, and an update that includes this fix for the 1.15 version is coming soon :)

Thank you :D that what i call quick reaction