Park a single ship in the Bosphorus Strait. This disables the land bridge for the AI, forcing it to recalculate and stopping the endless unit shuffling between Rumelia and Anatolia.

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The intro screen flashed. He loaded his campaign.

with the legendary DarthMod , you’ve likely hit the "Ottoman Wall." You hit "End Turn," and everything is fine until the Ottoman Empire's flag pops up—then the game hangs for 10, 20, or even 60 minutes.