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Flutter Impeller: A New Dawn for Flutter Apps Performance

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Nidhi Sorathiya

August 1, 2023

Nidhi Sorathiya

August 1, 2023

Have you ever witnessed janky animations and sluggish performance in your mobile apps? If yes, then you have battled with the term 'shader compilation jank'. This refers to the stuttering that takes place during the first run of your animations, a consequence of on-the-fly shader compilation.

Shaders are essentially code pieces that run on a GPU. For new sequences of draw commands, the Skia graphics backend that Flutter uses for rendering sometimes generates and compiles a custom GPU shader. This compilation process, unfortunately, happens concurrently with the frame workload and can take a few hundred milliseconds - causing multiple frames to be missed and an FPS drop from 60 to 6.

But now, Flutter has a solution to this- The all-new Flutter Impeller. It's a rendering runtime that promises smoother animations and significantly improved app performance.

What is Flutter Impeller?

Impeller in Flutter

Flutter Impeller is a revolutionary new rendering engine introduced to tackle the common issues in app performance. Unlike the traditional system where the shaders compile at runtime, with Impeller, all necessary shaders are precompiled during the build of the Flutter Engine. This means your apps already have all the shaders they need without causing jank in your animations.

Benefits and Objectives of Impeller

Flutter Impeller has been introduced with a set of prime objectives aimed at optimizing the Flutter app performance significantly.

Predictable Performance

With Impeller, all shader compilation and reflection occur offline at build time. This eliminates on-the-spot shader compilation, leading to faster and more stable animation performance.


Impeller tags and labels all graphics resources. This feature allows animations to be captured and stored without affecting individual frame rendering performance.


Flutter Impeller is not tied to a specific client rendering API. Due to this, shaders are authored once and converted as needed, making it simpler and more effective.

Uses Modern Graphics APIs Effectively

Impeller utilizes modern graphics APIs such as Metal on iOS and Vulkan on Android to their full potential. This ensures better animations and removes a standard source of "jank".

Makes Effective Use of Concurrency

Impeller successfully manages to distribute single-frame workloads across multiple threads. This further enhances the performance by improving the computing resource utilization.

In a nutshell, though still under development, Impeller holds great potential in enhancing the Flutter impeller performance by effectively eliminating jank.

Impeller Availability

Impeller on iOS

Are you a Flutter developer crafting apps for iOS users? You're in luck! As per the latest release, Flutter now enables Impeller by default on iOS.

However, if you wish to disable Impeller during debugging, simply pass '--no-enable-impeller' to the Flutter run command, as shown below:

To disable Impeller while deploying your app, you need to add the following tags under the top-level '<dict>' tag in your app’s 'Info.plist' file:

The Flutter team is continuously working to improve iOS support. If you encounter any performance or fidelity issues with Impeller on iOS, you can file an issue in the GitHub tracker with a small reproducible test case.

Impeller on Android

While Flutter Impeller shows promise on iOS, it's still under active development for Android applications. However, developers curious about navigating future directions can experiment with Impeller in the stable 3.7 or later releases.

To enable Impeller on Android, you can either pass '--enable-impeller' to the 'flutter run' command as follows:

Or add the following tag to your 'AndroidManifest.xml' file under the '<application>' tag.

This command activates Impeller, providing early adopters with an opportunity to explore its potential.

Experience with Impeller

Experience Impeller
Experience Impeller

Unlocking an immersive app experience is one of the key virtues that set Flutter Impeller apart. The improvements in performance and fluidity it brings about stem from the way it leverages hardware-accelerated graphics APIs: in iOS, it harnesses Metal, and in Android, Vulkan.

Impeller precompiles a set of simplified shaders at the engine build time, thereby avoiding runtime compilation. This approach drastically cuts down on jank, gives the graphics a boost, and leads to faster performance. This novel Impeller graphics approach means developers can now push the boundaries of app performance further than before, and that too without breaching the holy grail of 60Hz refresh rates.

By introducing excellent handling of concurrency, single-frame workloads can also now be distributed across multiple threads when required. This implies Impeller can balance the load effectively across a range of hardware performance levels, thus making Flutter apps really sing on all kinds of devices.

Getting Started with WiseGPT!

And there we have it. Flutter Impeller, with its brand-new rendering runtime, holds immense promise in revolutionizing how we deal with the performance and elegance of Flutter apps. Its innovative approach to using precompiled shaders and effective balancing of workload promises an app experience devoid of jank and full of responsive fluidity.

Although it's currently under active development, the initial signs, particularly on iOS, show significant potential. Android developers, too, have an experimental version to explore and anticipate what's coming down the line. Therefore, for developers looking to create hassle-free, smooth, and compelling Flutter applications, embracing Impeller now could very well be a game-changer.


Before you go, I want you to introduce a powerful IDE plugin WiseGPT! WiseGPT is a game-changer for all you Flutter enthusiasts out there! This powerhouse tool generates API code right into your Flutter apps. Its superpower? There's no cap on the output size, and it mirrors your unique coding style to make the generated code blend like a co-companion into your project.

Rather than hassle with creating models, and functions, parsing manual API requests, or coming up with error management strategies for those hairy API endpoints, you can turn to WiseGPT! This nifty tool takes care of it all, leaving you to glide through the development process smoothly.

As we continue our adventure in the Impeller journey, tools like WiseGPT act as our trusted companions, helping us craft efficient and solid web apps. I urge you to try it- WiseGPT truly can revolutionize your Flutter project.

Remember, becoming great at anything is all about learning, experimenting, and most importantly, creating phenomenal web apps. So here's to constant growth- Happy coding, folks!

Frequently asked questions

Frequently asked questions

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