Apple Watch Receives APNs Notification with delay (ONLY when it's connected with iPhone)

APNs Notification Receive time on Apple Watch

  • Connected with iPhone
    • approximately 10-15 seconds
  • Without Connection with iPhone
    • Immediately (less than a single second)

Does anyone know why the situation that I've wrote above?

I cannot find any word from Apple Developer References.
Why Apple Watch gets its APNs Notification delayed when connected with phone?

Apple Watch Receives APNs Notification with delay (ONLY when it's connected with iPhone)
 
 
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