android - Firebase listeners first time invocation takes time

Question

First time listener firing takes so much time (approx. 40s), subsequent loads takes lesser time (approx. 1s), how can speed up the first time load as well?

I have given,

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

on start of the activity.

        DatabaseReference ref = FirebaseDatabase.getInstance().getReference("");
        ref.keepSynced(true);
        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

Answer 1

Waitting for answers