[Flutter] Flutter contact loading takes so much time

I want to load all phone contact. For loading contact I am using contact_service package. But this takes so much time almost 5-12 sec. In native Android it takes almost no time. Is there any alternative solution for this problem?

My code:

getContacts() async{
var contacts = await ContactsService.getContacts();

setState(() {
_contacts = contacts;
}

}

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