Forge version: 1.12.2 - 14.23.0.2512
Twilight Forest version: MC 1.12.2 - 3.2.155 (Was happening on the other version of 1.12.2 as well)
Link to crash log: https://gist.github.com/Nerdstic/d0ef5999a5181a78a669434d037dabb4

Steps to reproduce:

1. I have been watching the server console whilst my friend and I were travelling through the Twilight Forest and this

[Server] Server thread/WARN Can't keep up! Did the system time change, or is the server overloaded? Running 14129ms behind, skipping 282 ticks(s)

kind of message would appear even if we had only taken a few steps. It usually fills up the console before it will lag the game so much that it ends up crashing and then another message will pop up right before the server crashes. (Something about it hitting the max skipped ticks, I would insert the line but I cannot seem to find it at this moment)

It has been happening for awhile now, but we managed to still beat all of the bosses and such, ignoring the multiple crashes we've incountered. Surely it was annoying, but we just enjoy the mod so much that we managed to look past it.

We only seem to have this issue when travelling through the twilight forest, when we're in the overworld, nether and end we have no problems at all.

I hope I provided enough information.. I've never reported a thing like this before, so I dont know if I'm doing it correctly or not. I do apologize if I haven't done it correctly. And if there is anything else you need, please do let me know.

Thank you.

it's just lag (which we're trying to work on), try pregenerating your world

^