Android : How to add 1 milion items in Realm correctly?

I want to choose between native SQLiteDatabase and Realm to deal with a big amount of data.

For benchmark I add to storage 1 milion of Product entities:

{id:integer,sku:string,name:string,data_creating:string}

Using SQLiteDatabase it takes near 1:34 min on my device.

Using Realm it takes more them 10 minutes.

My code is:

Realm realm = Realm.getInstance(getApplicationContext());
realm.beginTransaction();
for(int i = 0 ; i < 1000000;i++){
    Product product = realm.createObject(Product.class);
    product.setId(i+1);
    product.setName("Product_"+i);
    product.setSku("SKU__"+i);
    product.setDateCreated(new Date());
}
realm.commitTransaction();

How can I improve my code for better time performance?