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It's almost certainly an optimization bug. I'm aiming to do another performance pass with 1.3.

 It could also be a bug in pathing that's already fixed for 1.3. If an entity or warband gets stuck trying to reach somewhere, performance takes a major hit. 

thx for the info. But it is appearing also without moving warbands. So I guess it is not caused by pathing. My settlement population has crossed 150 ppl, could this cause lag or crashes? 

If it's the same world from your bug report, there don't seem to be any stuck warbands, just run-of-the-mill poor optimization.

The longer world updates take, the more chance of encountering an edge case that crashes the game. So the bigger worlds get, the more likely a crash will happen.

yes this one is the crashed savegame. ok I will see how it will be working then.
I will try not to expand the world to much ;)