Dart is designed for fast apps. It compiles to native code for both iOS and Android, helping your app run smoothly at 60 frames per second or more. Dart's just-in-time (JIT) compilation speeds up development with hot reload, while ahead-of-time (AOT) compilation ensures quick startup and efficient runtime. Memory use is optimized, but large Dart codebases can increase app size and memory slightly.
To keep your Dart app running at 60fps, avoid heavy work on the main thread. Use asynchronous programming with async and await to prevent UI freezes. Minimize object creation in build methods and reuse widgets when possible. Use Dart's const constructors to reduce rebuild costs. Profile your app with Flutter DevTools to find and fix slow code.
Dart code compiles into native machine code, which adds to your app's bundle size. Using Dart's tree shaking removes unused code, keeping the app size smaller. However, including many packages or large libraries increases size and startup time. To reduce size, remove unused dependencies and use deferred loading for rarely used features.
Dart compiles to native ARM code on both platforms, but iOS requires AOT compilation and strict code signing. Android supports both AOT and JIT, allowing faster development cycles. Dart's garbage collector and runtime are optimized for each platform, but startup times may vary slightly. Flutter and Dart handle platform differences internally, so your Dart code runs similarly on both.
Apple App Store requires apps to be signed with a valid certificate and comply with their Human Interface Guidelines. Dart apps built with Flutter must follow these rules, including privacy policies and no private API use. Google Play requires APK or AAB signing and adherence to content policies. Both stores expect apps to be stable and performant, which Dart helps achieve through its efficient compilation.
Your app takes 5 seconds to load this screen. What's likely wrong?