i have found a bug on Linux where the game is essentially lag-less but after stating lots of commands such as building or mining it lags when scrolling or moving the camera as-well as selecting areas to mine or build, this is not consistent though.
Another bug is when blowing a large number of explosives (around 60 or 70) make the game freeze for a few seconds (I was also destroying rubble that may have been a factor)
The lag i think is because of the fact that every chance recalculates pathing for every creature on the map.
And damm 60/70 explosives at once d-:
I will see if i can test this when i get home. (If my linux HD arrived)