Since the server upgraded to 1.12.2 the world chunks that were created by 1.11 minecraft is believed to be corrupted. I have made this discovery just recently and needed to take action as soon as possible. This may have been the reason why players are lagging so much recently.
I need to make sure to check every chunk for any corruption and dispose of it if any is detected. This means some builds may have been built on corrupted chunks that would be deleted. In which case will not be restored. We are trying to save as much progress as possible. If everything goes as expected the server should be up and running by Sunday, Nov 25th. 10:00 pm CT. Thank you all for your patience.