class Slow extends StatefulWidget {
  Slow({Key key}) : super(key: key);

  @override
  _SlowState createState() => _SlowState();
}

class _SlowState extends State<Slow> {
List _list = [
  {
    "code": "110000000",
    "region": "11",
    "district": "0",
    "locality_center": "0",
    "locality": "0",
    "ru_name": "Акмолинская область",
    "kk_name": "Ақмола облысы"
  },
// 14215 maps
];

@override
Widget build(BuildContext context) {
    print('it takes a few seconds before this message is printed in terminal');
    print(_list.length);
    return Container();
}
}