Firebase auth takes too long

[BlinkAC]

Hi I'm new in flutter, I'm doing an app wich uses firebase authentication (google sign -in and anonymously) and everything works as it should, however boths methods takes too long, when I click any of the 2 avaliable methos takes around 4 minutes to log-in in the app.
I have readed that this maybe could be my internet (I don't think so) or because I am running in debug mode, i am testing in 2 physical devices (Moto E4 plus and Huawei Y9 2019).
Any reply or recommendation on how improve the speed is thankful.

Here is the steps to reproduce

Main

import 'package:cursoflutter/app/singin/landing_page.dart';
import 'package:cursoflutter/services/auth.dart';
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'IU/home.dart';

Future <void> main() async{
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Pricy',
      theme: ThemeData(
        primarySwatch: Colors.green
      ),
      home: LandingPage(
        auth: Auth(),
      ),
    );
  }
}

Landing Page

import 'package:cursoflutter/IU/home.dart';
import 'package:cursoflutter/app/singin/sing_in_page.dart';
import 'package:cursoflutter/services/auth.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

class LandingPage extends StatelessWidget {
  const LandingPage({Key? key, required this.auth}) : super(key: key);
  final AuthBase auth;

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<User?>(
      stream: auth.authStateChanges(),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.active) {
          final User? user = snapshot.data;
          if (user == null) {
            return SingInPage(
              auth: auth,

            );
          }
          return ScaffoldEx(
            auth: auth,
          );
        }
        return Scaffold(
          body: Center(child: CircularProgressIndicator(),),
        );
      },
    );
  }
}

Home page

import 'package:cursoflutter/services/auth.dart';
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class ScaffoldEx extends StatelessWidget {
  ScaffoldEx({Key? key, required this.auth}) : super(key: key);
  final AuthBase auth;

  Future<void> _signOut() async {
    try {
      await auth.signOut();
    } catch (e) {
      print(e.toString());
    }
  }

  final CollectionReference ref =
      FirebaseFirestore.instance.collection("bebidasDeportivas");
  //Permite acceder a propiedades mas rapido sin tener que hacer como Home
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Barra superiror"),
        centerTitle: true,
        backgroundColor: Colors.green,
        actions: [
          TextButton(
              onPressed: _signOut,
              child: Text('Cerrar sesión',
                  style: TextStyle(
                    fontSize: 15,
                    color: Colors.white,
                  ))),
          // IconButton(onPressed: null, icon: Icon(Icons.camera))
        ],
      ),
      floatingActionButton: FloatingActionButton(
        backgroundColor: Colors.indigo[300],
        child: Icon(Icons.camera_enhance_outlined),
        onPressed: () => debugPrint("Escanear"),
      ),
      backgroundColor: Colors.white,
      body: StreamBuilder(
          stream: ref.snapshots(),
          builder:
              (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
            if (!snapshot.hasData) {
              return Center(
                child: CircularProgressIndicator(),
              );
            } else {}

            return ListView(
              scrollDirection: Axis.horizontal,
              children: snapshot.data!.docs.map((document) {
                return Align(
                  alignment: Alignment.topCenter,
                  child: new Stack(children: [
                    new Container(
                      margin: EdgeInsets.only(left: 5, right: 10),
                      width: 130, //MediaQuery.of(context).size.width,
                      height: 180, //MediaQuery.of(context).size.height,
                      child: Text(document['nombre'] +
                          "\nPrecio: " +
                          document['pHEB'].toString()),
                      alignment: Alignment.bottomCenter,
                      decoration: new BoxDecoration(
                        color: Colors.blue[200],
                        borderRadius: BorderRadius.circular(7),
                      ),
                    ),
                    new Container(
                      child: Image.network(document['image']),
                      width: 120,
                      height: 130,
                      margin: EdgeInsets.only(left: 10.5, top: 1),
                      alignment: Alignment.topCenter,
                    ),
                  ]),
                );
              }).toList(),
            );
          }),
      bottomNavigationBar: BottomNavigationBar(items: [
        //Necesita por lo menos 2
        BottomNavigationBarItem(icon: Icon(Icons.home), label: "Inicio"),
        BottomNavigationBarItem(icon: Icon(Icons.help_center), label: "Ayuda"),
      ]),
    );
  }
}

Sign-in page

import 'package:cursoflutter/common%20widgets/custom_elevated_button.dart';
import 'package:cursoflutter/services/auth.dart';
import 'package:flutter/material.dart';
// import 'package:firebase_auth/firebase_auth.dart';

class SingInPage extends StatelessWidget {
  const SingInPage({Key? key,required this.auth}) : super(key: key);
  final AuthBase auth;

  Future<void> _singInAnnonymous() async {
    try {
      final user = await auth.signInAnonymously();
    } catch (e) {
      print(e.toString());
    }
  }

  Future<void> _singInWithGoogle() async {
    try {
      final user = await auth.signInGoogle();
    } catch (e) {
      print(e.toString());
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Verificador de precios'),
        elevation: 2,
      ),
      body: _singInContent(),
      backgroundColor: Colors.grey[200],
    );
  }

  Widget _singInContent() {
    return Container(
      padding: EdgeInsets.all(16),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Text(
            'Registro de usuario',
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 32,
              fontWeight: FontWeight.w500,
            ),
          ),
          SizedBox(
            height: 48,
          ),
          CustomElevatedButton(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                Container(
                  child: Image.network(
                      'https://www.paderborn-meinestadt.de/wp-content/uploads/2016/07/Facebook-Logo-Paderborn.png'),
                  width: 40,
                  height: 40,
                  margin: EdgeInsets.all(4),
                ),
                // Image.network(
                //     'https://www.paderborn-meinestadt.de/wp-content/uploads/2016/07/Facebook-Logo-Paderborn.png'),
                Text(
                  'Registrarse con Facebook',
                  style: TextStyle(color: Colors.white, fontSize: 15),
                ),
                // Opacity(
                //   opacity: 0.0,
                //   child: Image.network(
                //       'https://www.paderborn-meinestadt.de/wp-content/uploads/2016/07/Facebook-Logo-Paderborn.png'),
                // )
              ],
            ),
            color: Color(0xFF334D92),
            radius: 4.0,
            onPressed: () {},
          ),
          SizedBox(height: 8.0),
          CustomElevatedButton(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                Container(
                  child: Image.network(
                      'https://imagepng.org/wp-content/uploads/2019/08/google-icon.png'),
                  width: 40,
                  height: 40,
                  margin: EdgeInsets.all(4),
                ),
                // Image.network(
                //     'https://imagepng.org/wp-content/uploads/2019/08/google-icon.png'),
                Text(
                  'Registrarse con Google',
                  style: TextStyle(color: Colors.black87, fontSize: 15),
                ),
                // Opacity(
                //   opacity: 0.0,
                //   child: Image.network(
                //       'https://imagepng.org/wp-content/uploads/2019/08/google-icon.png'),
                // )
              ],
            ),
            color: Colors.white,
            radius: 4.0,
            onPressed: _singInWithGoogle,
          ),
          SizedBox(height: 8.0),
          CustomElevatedButton(
            child: Text(
              'Registrarse con Correo',
              style: TextStyle(color: Colors.white, fontSize: 15),
            ),
            color: Colors.teal.shade700,
            radius: 4.0,
            onPressed: () {},
          ),
          SizedBox(
            height: 8.0,
          ),
          Text(
            'o',
            style: TextStyle(fontSize: 14, color: Colors.black87),
            textAlign: TextAlign.center,
          ),
          SizedBox(height: 8.0),
          CustomElevatedButton(
            child: Text(
              'Ingrese de forma anonima',
              style: TextStyle(color: Colors.white, fontSize: 15),
            ),
            color: Colors.lime.shade600,
            radius: 4.0,
            onPressed: _singInAnnonymous,
          ),
        ],
      ),
    );
  }
}

auth class

import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';

abstract class AuthBase {
  User? get currentUser;
  Future<User?> signInAnonymously();
  Future<void> signOut();
  Stream<User?> authStateChanges();
   Future<User?> signInGoogle();
}

class Auth implements AuthBase {
  User? get currentUser => FirebaseAuth.instance.currentUser;
  final _firebaseAuth = FirebaseAuth.instance;

  Stream<User?> authStateChanges() => _firebaseAuth.authStateChanges();

  @override
  Future<User?> signInAnonymously() async {
    final userCredentials = await _firebaseAuth.signInAnonymously();
    return userCredentials.user;
  }
  @override
  Future<User?> signInGoogle() async {
    final googleSignIn = GoogleSignIn();
    final googleUser = await googleSignIn.signIn();
    if(googleUser != null){
      final googleAuth = await googleUser.authentication;
      if(googleAuth.idToken != null){
        final userCredential = await _firebaseAuth.signInWithCredential(
          GoogleAuthProvider.credential(
            idToken: googleAuth.idToken,
            accessToken: googleAuth.accessToken,
          )
        );
        return userCredential.user;
      }else{
        throw FirebaseAuthException(
          code: 'ERR_ID_NOT_FOUND',
          message: 'Error no se ha encontrado id de google'
        );
      }
    }else{
      throw FirebaseAuthException(
        code: 'ERR_ABORTED_BY_USER',
        message: 'Error registro cancelado por usuario',
      );
    }
  }

  @override
  Future<void> signOut() async {
    await _firebaseAuth.signOut();
  }
}