Using an App Bundle instead of a universal APK helps deliver only the code and resources needed for the user's device. This reduces app size on the device, which can improve startup time and reduce memory usage. Smaller downloads also save battery during installation and updates. APKs include all resources for all devices, which can slow down installation and increase storage use.
App Bundles enable Google Play to generate optimized APKs per device configuration, reducing unnecessary code and resources. This leaner install means less memory pressure and faster load times, helping maintain smooth 60fps UI rendering. Avoid bundling unused libraries or large assets in your base APK to keep the app responsive.
App Bundles typically reduce the download size by 20-50% compared to universal APKs. This smaller size leads to faster downloads and installs, improving user experience. Startup time improves because the app loads fewer resources and native libraries. APKs can be larger and slower to start due to including all device variants.
Android uses APKs or App Bundles for app distribution. App Bundles are Google's recommended format for Play Store publishing. iOS uses a different system with IPA files and App Thinning, which similarly delivers optimized assets per device. Android App Bundles require Google Play for dynamic delivery, while APKs can be sideloaded. iOS apps must be signed and distributed via the App Store or TestFlight.
If your app uses a universal APK, it might be loading unnecessary resources or native libraries for other device types, causing slow startup. Switching to an App Bundle can reduce this overhead. Also, check for large assets or blocking operations on the main thread delaying UI rendering.