Quick Summary:

Nowadays, product owners require high-performance applications to keep their users engaged with the app. Lagging and skipped frames annoy users and give them a bad user impression. Therefore it is necessary to have a feature-rich app offering their user behavior to run smooth applications. This blog post will guide you on how to improve Flutter performance in your existing app.

Table of Contents


Flutter has become the most preferred and used framework for cross-platform application development. Flutter framework runs on Dart programming language, which Google develops. Flutter reduces the development cost and brings flexibility to application development for all platforms. This makes Flutter one of the powerful frameworks for application development.

Flutter Vs React Native Performance

Both the frameworks are equally capable of providing great performance. However, Flutter has the upper hand as it is most flexible in working with heavy files that consume more memory. React Native Applications are lighter in weight but use more power which is a negative aspect of performance.

Flutter complies with native code that automatically increases flutter web performance and cross-platform application performance. Moreover, Flutter tools can be used for platforms such as embedded (infotainment systems used in vehicles).

Top Flutter Performance Optimization Tips

In this part of the blog, adequate information has been provided that will help you to increase the Flutter performance of your application.

Optimization tips for flutter performance

Avoid State Flutter Widgets

The common mistake we all make is using State Flutter widgets for Flutter App development at the beginning of development. Stateful widgets can be used if your application has a large build function and you want to rebuild.

SetState() and StatefulWidget should only be used to rebuild or update. Moreover, it is better to avoid using it in whole widgets for better Flutter performance.

Use Const Keyword

Const keyword works as a constant, which is a type of Flutter widget used at a time of compilation to avoid. Const allows using multiple widgets without reducing performance. Another benefit of using const is that it avoids rebuilding whenever you use different widgets.

Use case of Const

Copy Text
const EdgeInsets.fromLTRB(16, 4, 16, 8);
const Color lightGray = Color(0xFFFEFEFE);
const Text('This is a static text')

Try Using Async/Await

It is necessary to check at the time of development that the code which is used in the application is synchronous or asynchronous. With the help of Async/Await, code can be written asynchronously in the Flutter application.

Async code is tough to upgrade, and debugging the Asynchronous code is also difficult. However, the code’s readability increases when combined with Async.

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Develop And Display Frames Within 16ms

The display is divided into two parts: structure and picture. Developers have 8ms for structure and another 8ms for the picture to render a 60hz display.

Always divide 16ms equally between structure and picture for better flutter performance in your application.

You must be wondering about the 16ms will decrease the display quality? Don’t worry; 16ms will not affect the quality of the display. It is going to improve the battery life of the system. Moreover, with 16ms, you can get better performance on smaller devices.

Ignore Rebuilding of Widget in AnimatedBuilder

Animation is one of the most attractive features in any web or mobile application. It grabs the user’s attention, but at the same time, it decreases the performance of the application.

Developers generally use AnimationController. However, it rebuilds multiple widgets in AnimatedBuilder, and that’s the common reason behind the slow Flutter performance.

To avoid bad performance issues, you can use CounterWidget, which helps develop animation without rebuilding multiple widgets.

Avoid Build Method

Try to avoid using the Build() method as it is costly and consumes lots of CPU power. Repetitive use of Build() can decrease the Flutter performance. To get the best Flutter performance in your existing application, you can divide the large widgets developed with the Build() method into smaller ones.

Decrease Application Size

At the time of development, it is easy to use multiple packages, codes, and widgets in an application. But sometimes, it requires high memory to store all of this data, which also decreases the application’s performance.

Flutter’s development tool provides an advantage of reducing the application size. With the help of Gradle, you can reduce the Flutter application size to optimize Flutter performance.

Using the packaging system introduced by Google, you can create bundles of Android applications. App Bundles are beneficial in many ways. One of the main features of the app bundle is that it allows you to download original code from the Google Play Store. Google Play Store provides applications that are compatible with the device and supports the platform’s architecture.

Key Take Away On Flutter Performance

Flutter performance optimization has always been great as Flutter as a framework has provided tremendous support in web and native application development. It is also compatible with heavy visual effects applications.

However, it is necessary to have Flutter performance optimization to avoid unwanted errors and slow performance. Flutter brings scalability, reliability, and security to your application, and if you are want to optimize your Flutter application, then contact a Flutter app development company like bacancy for outstanding optimization services.

Frequently Asked Questions (FAQs)

Follow the below steps to speed up your Flutter App performance:

  • Decrease the usage of Opacity.
  • Avoid dividing all widgets into methods.
  • Divide codes into smaller ones to get high performance.
  • Avoid rebuilding widgets.

Const is a keyword used to store the variable’s value known at compilation. More simply, the compiler has an idea about the value in advance.

In Flutter, there are various types of ListView which are mentioned below:

  • ListView
  • AnimatedListView
  • ListWheelScrollView
  • Reorderable List View

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