Push notifications use minimal device resources when idle. They rely on system services (APNs on iOS, FCM on Android) to deliver messages efficiently.
Receiving notifications does not affect frame rate or battery significantly unless your app processes heavy tasks on notification receipt.
Background processing triggered by notifications can increase CPU and battery use, so keep tasks short and efficient.
Use silent notifications sparingly to avoid waking the app unnecessarily.
Process notification data quickly and defer heavy work to background tasks or server-side.
Batch notifications on the server to reduce frequency and avoid spamming users.
Use APNs and FCM best practices: set appropriate priority and expiration to avoid wasted resources.
Integrating APNs requires no extra app size as it is built into iOS.
Adding Firebase Cloud Messaging (FCM) SDK increases app size by a few megabytes depending on included features.
Keep Firebase SDK minimal by only including messaging if needed to reduce bundle size.
Push notification setup does not affect app startup time significantly.
iOS uses Apple Push Notification service (APNs) which requires device tokens and strict code signing.
Android uses Firebase Cloud Messaging (FCM) which supports topic messaging and direct device tokens.
iOS notifications require user permission prompt; Android permissions vary by OS version.
Handling notification payloads differs: iOS uses UNUserNotificationCenter, Android uses NotificationManager.
Your app takes 5 seconds to load this screen after receiving a push notification. What's likely wrong?
Answer: The app is performing heavy processing on the main thread when handling the notification. Optimize by moving work to background threads and keep notification handling lightweight.