The way provinces work in the game, any piece of land that touches another is considered adjacent. So at the bottom of the map, there's a long thin stretch of The Hill, along with a single pixel for every province in the game. The border gore is in a big part because it messes with the AI's ability to tell what provinces are close by. I am not sure what caused the late game lag but it took over 20 minutes per year by 1810.
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