@cuddle@Mesoklima@stefano Many apps depend on Google's Firebase Cloud Messaging service for push notifications on Android. On iOS, the only choice is using Apple's equivalent service. On Android, apps are able to implement their own push with their own service or support third party ones via UnifiedPush. All of these approaches work perfectly on GrapheneOS without delays. There aren't only delays if someone is choosing to avoid using FCM for apps not providing an alternative.