Ok there is a not so funny thing going on with my server right now. If noone is on the server the load increases and have a peak every 20 seconds or so resulting in skipping ticks.
But when i'm online the server is smooth and everything is fine.
It seems like it is a problem with logistics pipes, according to the aikar timings reports.
Unfortunately I have to use chunkloaders to prevent problems with the IC2 energy net, that's why everything is running continuously even noone is online.

To get an idea maybe this reports will help you more then me.

This is when the server is empty (after someone was online):
https://timings.aikar.co/?id=bcf75deefe1b42d0a2a9513db4a2c425

This is when one player is online and in his big base:
https://timings.aikar.co/?id=dde248f6900644199bdea029a5799703

Server is running on my laptop (thats why it's a bit irritating when the fans are spinning up every bunch of seconds. And also it's a RL energie issue wich coasts RL money.)
Laptop/Server specs:
i7 4790k
32GB RAM
NVME SSD

startline: java -Xmx16G -Xms12G -jar forge-1.12.2-14.23.5.2838-universal.jar nogui

Edit: Just noticed, the load problem does not occur if no one is connected after a fresh restart of the server. Only if someone WAS online and goes offline. That's the moment the problem begin.

is your whole LP network chunk-loaded or just parts of it?

is your whole LP network chunk-loaded or just parts of it?

This is actually a good question.
I removed "all known" chunkloader to test this but it seems like the problem don't change. Is there a cmd to unload all chunks over the server console?

I think you should rather chunk-load all of your network. That is a well-known practice.