Push notifications sent via Firebase Cloud Messaging (FCM) are usually delivered very quickly, but immediate delivery cannot be guaranteed right after sending. Delays may occur due to:

Network conditions on the user's device.
Power saving mode or background activity restrictions on iOS.
Temporary delays on the Firebase or APNs (Apple Push Notification service) side.

Therefore, while notifications are typically received almost instantly, guaranteed immediate delivery is not possible.

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Are push notifications sent via Firebase available… - sobes.tech