Alright! Basically, I was venturing through Kiwike when I found a castle, below the castle was a large hidden room that I stumbled upon. In this large hidden room was a lag machine, appropriately labeled by its creator. I don't know if this is a part of the lag in the past few days but either way, I'm disassembling it. Below is a picture. Whoever created it, nice work.
I think I may have crashed the server with it once, not sure.
EDIT - Hey everyone! Turns out the owner and creator of the place was Vikas. He informed me in game that it was broken by a creeper long ago. So I guess it wasn't any main source of lag from before but when turned on, it can indeed cause some.