I just think I should report this. I am at version 3.1.1.
When I start an Argrarian Skies server it keeps prompting "Can't keep up, did the system time change....".
When that happens the server lags for 2 seconds. It happens exactly every 45 seconds.
The only way I know to solve this is by deleting the HQM file in the world folder "Players.dat".
!Be carefull, you lose all your quest progress by doing this.!
I don't know if I am the only one with this problem, but this is how I fixed it.
I'm suffering from this problem too. I really don't want to lose quest progress and am really regretting upgrading from 2.1.9 to 3.1.1. Things were running great before the upgrade. Been pulling my hair out trying to figure out why I'm getting so much blog and chat lag. Not quite ready to give up quest progress though.