Performance of ejabberd

Hello everyone.

Now I'm trying to use ejabberd as information notify tool.
There are 400,000 client and the informant'll send message each client per second.
But there are some problem about that.

(1)
ejabberd not clustered can process only 4000 clients.
If ejabberd has 5000 clients, it uses over 5 second to delivery message.

(2)
Clustered ejabberd uses over 10 seconds to delivery message.
This case each ejabberd has 4000 clients.

How do I do for these issue?

Thanx

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