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Optimizing App Size and Load Time in Flutter

Optimizing App Size and Load Time in Flutter

In today’s fast-paced digital world, no one likes a slow, bloated app. Users expect smooth experiences, quick load times, and lightweight applications that don’t eat up storage space. If your Flutter app takes forever to load or is too large to download, you could be losing users before they even get started!

Here are some key things to note:

 

1. Reduce App Size

  • Enable ProGuard (For Android)
    Minifies and obfuscates the code to reduce size:

    android {
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

  • Use Split APKs (ABI Splitting)
    Generate APKs for different architectures to reduce the overall size:

    flutter build apk --split-per-abi

  • Optimize Assets

    • Compress images using formats like WebP.
    • Use flutter_svg for vector images instead of large PNGs.
    • Minimize fonts by only including necessary characters.

  • Remove Unused Dependencies
    Run:

    flutter pub deps --unused

    and remove unnecessary dependencies.

  • Use Tree Shaking for Dart Code

    • Removes unused code in Dart files automatically in release mode.

 

2. Improve App Load Time

  • Use Lazy Loading for Images
    Load images only when needed using cached_network_image:

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

  • Optimize Build Methods
    Avoid unnecessary widget rebuilds by using const constructors and Provider for state management.

  • Reduce Initial Load Size

    • Keep the number of dependencies minimal.
    • Use lightweight animations.
    • Reduce excessive computations in initState().

  • Use Code-Splitting (Deferred Loading)

    • Load large libraries dynamically:
    import 'package:deferred_library.dart' deferred as myLibrary;

Future<void> loadLibrary() async {
  await myLibrary.loadLibrary();
  myLibrary.someFunction();
}

  • Optimize Network Calls

    • Use efficient API response formats like compressed JSON.
    • Implement caching to reduce redundant requests.

 

 

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