The lag happens because the Ottoman AI gets stuck in a loop trying to move units across the Bosphorus strait. You can stop this manually in-game.
Get the "Empire Total War Ottoman Turn Lag Fix" script from ModDB or the Total War Center. Action: Run the script while your save game is loaded.
Empire: Total War is a masterpiece of scale, but the infamous Ottoman turn lag in DarthMod can bring even the most powerful gaming rigs to a standstill. This issue occurs because the AI struggles to pathfind small, single-unit armies across the land bridge between Istanbul and Anatolia. empire total war darthmod ottoman turn lag fix top
Alternatively, place a single unit of militia on the specific land tiles where the AI gathers its "mini-stacks." 3. The "Destruction" Method
Manually find the Ottoman faction entries and delete units that consist of only 1-5 men. These "shards" are the primary cause of calculation lag. Summary Checklist for a Fast Campaign Block the Bosphorus with a ship. Run the "Clean Slate" script every 20 turns. Wipe out the Ottoman faction if the lag persists. The lag happens because the Ottoman AI gets
By blocking the "bridge," the AI stops trying to calculate a crossing, which often instantly resolves the turn-time hang.
It resets the AI's move orders, clearing the "unit shuffling" that causes the CPU to hang. 2. Block the Land Bridge (Physical Fix) Action: Run the script while your save game is loaded
To give you the best advice for your specific save, let me know: What is it in your campaign? Are you playing as the Ottomans or another nation? Do you have the ESF Editor installed?
While it makes the game harder, the default Empire AI is occasionally more stable regarding pathfinding loops.