This is a killer. In the campaign map, look at the bottom right. Uncheck the camera option.
: Park a single ship in the Bosphorus Strait to block the land bridge between Istanbul and Ankara. This often resets the AI's pathfinding and stops the shuffle. empire total war darthmod ottoman turn lag fix best
Go to options and turn off "Show CPU Moves". This stops the game from rendering every individual unit's shuffle, which can drastically reduce turn time. This is a killer
Place a fleet directly on the shipping lines/land bridges connecting Europe and Asia. empire total war darthmod ottoman turn lag fix best
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