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What latency can I expect with Azure hubs?

I'm wondering what kind of latency can you expect with Azure Hubs? the azure site simply mentions "low latency". are we talking minutes? seconds? milliseconds?

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Despite all the usual caveats about general Internet traffic, Azure Notification Hubs have extremely low latency. It is governed by the Service Bus SLA, which guarantees that 99.9% of messages are sent within 5 seconds every month.

Now when it hits various notification channels (WNS, APNS, GCM, MPNS), it might end up in a queue ... but you can't ask for a faster way to get messages on those channels to start with, without writing your own notification mechanism (and this is NOT a trivial task).



My experience is that thousands of messages can be sent in one second. Notification nodes are highly parallelized and distributed. Microsoft uses it for notifications sent from the Bing / MSN News app to post news and other apps, so they send hundreds of millions of messages in a minute or so.

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We're talking about seconds. However, the delivery time depends on network latency, which cannot be controlled, and the number of target devices makes sense - in the case of a million of them, this could take a minute or more.



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