(Hypothetical) github.com/example/WorldProvincesiOS
Instead of storing full GeoJSON strings, convert to MKPolygon coordinates and serialize as [CLLocationCoordinate2D] using NSKeyedArchiver . This reduces retrieval latency by 70%. World Provinces Download Ios
| Level | Without Compression | With TopoJSON + ZIP | |-------|--------------------|----------------------| | World (all 4000 provinces) | 420 MB | 118 MB | | Single large country (e.g., China 34 provinces) | 18 MB | 4.2 MB | | Small country (e.g., Belgium 10 provinces) | 1.2 MB | 0.3 MB | (Hypothetical) github
func savePolygon(_ polygon: MKPolygon, for provinceID: String) let coordData = try? NSKeyedArchiver.archivedData(withRootObject: polygon.coordinates, requiringSecureCoding: true) provinceEntity.boundaryData = coordData World Provinces Download Ios