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javascript - Firestore slow performance issue on getting data

I'm having slow performance issues with Firestore while retrieving basic data stored in a document compared to the realtime database with 1/10 ratio.

Using Firestore, it takes an average of 3000 ms on the first call

 this.db.collection(‘testCol’)
   .doc(‘testDoc’)
   .valueChanges().forEach((data) => {
     console.log(data);//3000 ms later
 });

Using the realtime database, it takes an average of 300 ms on the first call

 this.db.database.ref(‘/test’).once(‘value’).then(data => {
     console.log(data); //300ms later
 });

This is a screenshot of the network console :

Firestore slow performance issue get Data

I'm running the Javascript SDK v4.50 with AngularFire2 v5.0 rc.2.

Did anyone experience this issue ?

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