Sometimes the lag is caused by the AI trying to calculate a complex invasion route.

: Park a small fleet (even a single sloop) in the strait between Istanbul and Anatolia. This blocks the "land bridge," forcing the AI to stop its infinite shuffling of small stacks across the water.

He downloaded the file: Ottoman_Fix_v3.dat .

If you are at war with them, use a small, fast cavalry force to "sweep" the tiny single-unit armies they leave scattered around their capital. 3. Using the ESF Editor (The Hard Fix)

: Lowering certain graphical settings or disabling detailed province and unit models can sometimes alleviate performance issues.