How to improve the performance of Flutter apps

In mobile application development, the performance of the app is the biggest nightmare for every developer but we can optimize it using proper tools and making our code structure. In this blog post, we will discuss some tips and tricks to improve the performance of Flutter apps.

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In Flutter, there are certain ways to improve the performance of Flutter apps. You can go through the points below:-

Let’s improve the performance of Flutter apps

Use Stateless Widgets

Flutter has two types of widgets – stateful and stateless. Stateless widgets don’t change their state during the runtime of an application. They are simple, efficient, and fast. If your widget doesn’t need to change its state, use a stateless widget.

class MyStatelessWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Text('Hello, World!'),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {

@override

Widget build(BuildContext context) {

return Container(

child: Text('Hello, World!'),

);

}

Const Widgets

Use const widgets whenever possible because they are precompiled and do not have to be rebuilt every time the widget is rendered.

class MyConstWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return const Text('Hello, World!');
  }
}

class MyConstWidget extends StatelessWidget {

@override

Widget build(BuildContext context) {

return const Text('Hello, World!');

}

ListView.builder

If you need to create a scrollable list in your app, use ListView.builder. ListView.builder creates items on demand, which can save memory and improve performance.

class MyListView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 100,
      itemBuilder: (BuildContext context, int index) {
        return ListTile(
          title: Text('Item $index'),
        );
      },
    );
  }
}

class MyListView extends StatelessWidget {

@override

Widget build(BuildContext context) {

return ListView.builder(

itemCount: 100,

itemBuilder: (BuildContext context, int index) {

return ListTile(

title: Text('Item $index'),

);

}

CachedNetworkImage

If we are loading images from the network, use the CachedNetworkImage package. This package caches images to improve performance and reduce network requests. For loading the image using it, just add it to your project and import it where you want to load the image.

CachedNetworkImage(
  imageUrl: 'https://example.com/image.png',
  placeholder: (context, url) => CircularProgressIndicator(),
  errorWidget: (context, url, error) => Icon(Icons.error),
),

CachedNetworkImage(

imageUrl: 'https://example.com/image.png',

placeholder: (context, url) => CircularProgressIndicator(),

errorWidget: (context, url, error) => Icon(Icons.error),

API Caching in Flutter Applications

In order to check API Caching in Flutter , you can go through our blog.

Minimize the number of plugins

Plugins can add a lot of overhead to your app. Try to use only the plugins that you absolutely need.

Const constructors

If you are creating a lot of objects of the same type, use const constructors. Const constructors create objects at compile-time, which can improve performance.

class MyButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {},
      child: const Text('Click Me!'),
    );
  }
}

class MyButton extends StatelessWidget {

@override

Widget build(BuildContext context) {

return RaisedButton(

onPressed: () {},

child: const Text('Click Me!'),

);

}

Flutter inspector

The Flutter inspector is a powerful tool that you can use to debug and optimize your app. Use the Flutter inspector to identify performance issues and fix them.

Flutter Performance Profiling

Flutter has a built-in profiler that you can use to identify performance bottlenecks in your app. Use the profiler to identify areas of your app that are slow and optimize them.

Keys

Use keys to help Flutter identify which widgets have changed and need to be rebuilt. Keys can improve performance by minimizing the number of widgets that need to be rebuilt.

Types of keys:-

Value key
object Key
Unique key
Global Key

class MyStatefulWidget extends StatefulWidget {
  @override
  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      body: Center(
        child: RaisedButton(
          onPressed: () {
            _scaffoldKey.currentState.showSnackBar(
              SnackBar(content: Text('Button Pressed')),
            );
          },
          child: const Text('Click Me!'),
        ),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {

@override

_MyStatefulWidgetState createState() => _MyStatefulWidgetState();

}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {

final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

@override

Widget build(BuildContext context) {

return Scaffold(

key: _scaffoldKey,

body: Center(

child: RaisedButton(

onPressed: () {

_scaffoldKey.currentState.showSnackBar(

SnackBar(content: Text('Button Pressed')),

);

child: const Text('Click Me!'),

);

}

I hope from this, it will make you more comfortable dealing with flutter app performance query. Thanks for tuning in once again!

piyush pandey

5 Jun, 2023
Created by - piyush pandey

. . .

How to improve the performance of Flutter apps

Let’s improve the performance of Flutter apps

Use Stateless Widgets

Const Widgets

ListView.builder

CachedNetworkImage

Minimize the number of plugins

Const constructors

Flutter inspector

Flutter Performance Profiling

Keys

Types of keys:-

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