The Apple Push Notification Service provides a high-speed, high-capacity interface, so you should establish and maintain an open connection to handle all your notifications. Connections that are repeatedly opened and closed will affect the performance and stability of your connection to the Apple Push Notification Service and may be considered denial-of-service attacks. You should also connect regularly to the feedback service so you don’t send notifications to devices that no longer have your app installed. Learn more about connecting to the Apple Push Notification Service.