In my recent 1000+ cycles game, I decided to pool all water in a centralized location of the map. However, this causes significant stuttering during gameplay to the point the game hangs for 10 seconds several times in a minute. Even when the game is paused, some stuttering is observed. The game does not crash, but at times appears to reload as task manager shows large changes in memory usage (normally several GB in use, during the stutter back to several hundred megabytes). Not sure if this is related to the performance issues. I have attached the logs and savefile.
Load the savefile, and the stuttering should start when playing.