Suggestion: Remove all the concrete walls used as curbs or sidewalks. Makes it very complicated for AI to navigate

Looks like outdated arma1-2 assets break the perfomance of this map. FPS is too low even compared to Tanoa's Georgetown. Try to replace them with new ones. I know they may not fit well, but you'll still be able to complete the big-city appearance without sacrifising FPS.
Besides, some Apex assets can fit pretty well.

Montella, would be an amazing Liberation Map / Perhaps someone might pick up on that idea

Finish it. It's beautiful. Best map I have seen yet. You did a really great job with the airport. It is very cool for me to make a base defense mission there. I have not much of a problem with framerates.

the rocks north of verteglia around 007245 have no collision, and finishing the map will add to the entire experience. Lacuno is small and although nusco is larger it would still make a good town. Both of the already finished towns were much larger, and it might take less time.