Well, you will need to insert all the records into one object, and insert them in a row after row. If you want to do this, you will have to insert between the installation procedure. But it is recommended to insert one monolithic object once, as shown below.
storage.people.add(people_array, function(people_array){
console.log("people_array",people_array)
});
This should reduce the time it takes to save records.