Receive Android GCM messages so slow?

Question

Google Cloud Messaging (Push message) problem.
I have two smartphones(HTC Sensation XE, Desire HD) and a tablet(Samsung Galaxy Note 10.1 Wifi).
Sometimes I need to w

Answer 1

GCM uses throttling when there's excessive use, see the following document for more details:

http://developer.android.com/google/gcm/adv.html#throttling