I installed the Rapid Ring App for the first time last night and I have to say it is a big improvement on the main app with regard to speed of opening alerts.
I have tried it on my home wifi and also on ‘3G / 4G’ and speeds are quite similar.
I had a little issue changing the notification tone back to my preferred tone from the default tone, but Google helped me with that, and that is done in Android itself not inside the app.
I also like it as i can now install this app on my wifes phone, gives her the ability to see the cameras with a very simple app which is not over complicated with functions she doesnt need.
A good addition I would say.