: The game rules prevent the Ottoman AI from routing units through your military zone, instantly clearing the bottleneck. 3. Clear the Stacks via Console or War

This is the most effective technical fix:

: The AI creates 30 to 50 tiny armies consisting of just one or two units rather than consolidating them into a single 20-unit stack.

If the lag has already triggered and your game is frozen, you must eliminate the micro-armies causing the calculation loop.

: Go to your gameplay settings and turn off "Show CPU Moves" . This stops the engine from rendering every single-unit movement, vastly reducing turn times.

The good news? This isn't your PC’s fault. It’s a pathfinding bug caused by the AI trying to shuffle hundreds of single-unit stacks across the Bosphorus land bridge

The Ultimate Guide to the Empire: Total War DarthMod Ottoman Turn Lag Fix

If you aren't playing as the Ottomans, you can use DarthMod’s sub-mods or tools to fix their borders.