Push notifications have minimal impact on app frame rate and UI smoothness because they are handled by the system in the background. However, frequent or heavy notifications can increase battery usage and network data consumption. Memory usage is low since notifications do not run heavy code unless the app is opened from them.
To keep your app responsive at 60fps, avoid processing heavy tasks directly in notification handlers. Use lightweight data payloads and defer complex work until the app is active. Use expo-notifications APIs efficiently by registering listeners only when needed and removing them properly to prevent memory leaks.
Adding expo-notifications increases your app bundle size moderately due to native modules for iOS and Android. This can add a few megabytes but is generally acceptable. Startup time is not affected significantly because notification handling runs outside the main UI thread until the app is launched.
On iOS, users must grant explicit permission for notifications, and the system controls notification appearance strictly. Background notification handling is limited. Android allows more customization and background processing with fewer restrictions. Token registration and push service setup differ: iOS uses APNs, Android uses Firebase Cloud Messaging (FCM).
Your app takes 5 seconds to load this screen after tapping a notification. What is likely wrong?
Answer: The notification handler is doing heavy work on the main thread or blocking startup. Optimize by deferring processing until after the UI loads and keep notification payloads small.