Recently (having all the Mods) I ran into performance issues. If I keep the large map setting and do not expand the map by purchasing land. The game runs fine for me. As soon as I purchase land and the deep freeze occurs it bogs down the game so much. It becomes very unplayable. I began my build and add 10 janitors, 10 gardeners, 50 workers all the of the staff such as the warden and so fourth. I have 500 total population with almost the entire large map filled buildings. Long as I don't expand the game slows but playable. As soon as I expand and get a deep freeze the game becomes unresponsive and very sluggish. One time it crashed.