I had suddenly bad performance , it was one of the ant hills. See the post linked here: its the ant hill by the sandbox for me. It had 700 something peices of food . When I arrived there was 6 ants inside it and sooo much lag. Picking up on mass and then trashing the entire stack over and over until no food remained fixed my performance.
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Seeing the exact same thing here with 2 players on steam version . We started the save on 1.0 launch and of this weekend , me the host keeps seeing the 1 to 2 second pausing