Is there a way to fix fps issues at huge airports?

I have no problems using Fenix ​​a320 in regional airports but in big airports like LTFM there is such a big fps drop that the game becomes unplayable. I also tried FBW a320 in big airports like this and there is almost no problem with them. I resized the textures of Fenix ​​which improved my performance a lot but it’s still very bad in big airports. Is there anything I can do for the airport?