Hi the performance of the map is very importance to our mobile app. Right now, the map take 8 to 10 seconds to finish loading in our react-native mobile app. We checked the performance of the map via the browser tool and found out that most of the time is handle the basemap/basemap tile loading? We want to package the basemap/basemap tile into the mobile apps to improve the performance, how can we do it? If yes, Can we only package the NYC portion of the basemap/basemap tile into the package?
Is this a portion of an Esri basemap that you want to include? There are options to export the tiles and use them in your app. There is documentation about it here.
https://developers.arcgis.com/rest/services-reference/enterprise/export-tiles-map-service-.htm
Or using ArcGIS Pro you can use the 'Download Map" button on the Ribbon...
here are some blog articles about that.