Server Crashing

[Plaze_Demon]

Not sure if this is the right place to post this, I've never posted on these forums before.

 

Basically I run a tekkit classic server, which in peak times gets 25-35 players, and ALL THE TIME, like not even when we have alot of players on, our TPS isn't at 20, and I see no reason why. Also, we tend to crash, and I was hoping someone could help me analyse the error

 

Crash report: http://pastebin.com/5Y2vP9cf

 

Also, my console is constantly spammed with "Can't keep up" messages, and also sometimes it starts spamming "sending triang:" with a few numbers after it.

 

I have deleted the wireless redstone mods from my server so it can't be that, I just want to know if it's a plugin or what.

[j0ach1mmall3]

Sending triang is because of the Triangulator, and the crash is because of RedPower tubes, probably cause that mod is buggy and there are too many tubes in the world. Had that issue to back in the days.