Re: Big FPS drops iin battles and sieges with a high end pc
Usually it happens with mods as the unit textures as well as the model meshes are oversized. In sieges the building textures add to the lag, regardless if they are default or modded.
Have a look if you can really see any difference in the top unit detail settings - simply reducing the setting by one level might already help.
This should help for the settlement textures.
I followed this video recently and had some very satisfying FPS results: https://www.youtube.com/watch?v=9eFnUQFFcXo