[1.8]Custom Dim Lag Spikes

[Kczyku615]

Hi! I made a new dimension with blocks, entities, worldgen, etc... The problem is on server side. Every time I get this is console (only this thing is wrong)

"Can't keep up! Did the system time change, or is the server overloaded? Running 20741ms behind, skipping 286 tick(s)"

When I try to brake block in custom dimension it seems like the server has lags. (I am playing on Singleplayer).  Entities are also laggy. Original, and these which are mine

For Try I Deleted all the world generation excluding Generating Terrain. It didn't help. What can be a reason?

 

//Edit - found a reason - Custom chunk manager - need help fixing that

 

Forge 1.8 1405

Win 10 Technical Preview (maybe here's the problem?)

The whole code https://github.com/Kczyku/KetherBackup

[Kczyku615]

It's a lot of code. Post something certain or post the whole code on github?

[Kczyku615]

added

[Kczyku615]

Found a reason - custom chunk manager. Now question - why? What is wrong with it?