What are you playing (Grand Campaign, Custom, etc.)? Are you comfortable using third-party tools like EditSF? Share public link
The easiest and most effective way to solve the lag without editing game files is to manually block the AI's pathfinding route using navies or armies. empire total war darthmod ottoman turn lag fix best
The AI often breaks because it has no valid naval alternative to move troops between its European and Asian territories. What are you playing (Grand Campaign, Custom, etc