How to efficiently manage state in a large-scale Flutter application?

I’m working on a large-scale Flutter application and I’m facing challenges with state management. I’ve tried using setState, but it quickly becomes unmanageable as the app grows. I’ve also experimented with Provider and Riverpod, but I’m still unsure about the best practices for structuring state management in a complex app.

Here are some specific issues I’m encountering:

1.Performance: How can I ensure that my state management solution is performant and doesn’t lead to unnecessary rebuilds?
Scalability: What are the best practices for organizing state management in a way that scales well with the app’s complexity?
Maintainability: How can I keep my state management code clean and maintainable, especially when working with a team?
Here’s a simplified version of my current setup:

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => Counter(),
      child: MaterialApp(
        home: MyHomePage(),
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("State Management Example")),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('You have pushed the button this many times:'),
            Consumer<Counter>(
              builder: (context, counter, child) {
                return Text('${counter.count}');
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => context.read<Counter>().increment(),
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

class Counter with ChangeNotifier {
  int _count = 0;

  int get count => _count;

  void increment() {
    _count++;
    notifyListeners();
  }
}

What are the best practices for managing state in a large-scale Flutter application? Are there any specific patterns or architectures that can help address performance, scalability, and maintainability concerns?