I'm not sure how to really report this bug, but it seems that wild animals are causing a lot of lag ever since I've been trying out A15. Maps like Boreal Forest or Arid Shrub land can become near unplayable on any speed faster than 2x. The only solution I've found is a reload of the game, but that only seems to fix the problem for a little while. I've checked the Debug log during the lag spikes and the game doesn't seem to be throwing any errors. I never experienced this during A14 or older either.