Messages held for way too long

I have implemented a publish-subscribe architecture, the publisher sends exactly 30 messages to 30 clients. The implementation sort of works. When all 30 messages are sent, only 10 clients receive the message immediately the remaining 20 messages are not lost they are sent later (sometimes it takes an hour for the remaining messages to be delivered). I need the all messages to be delivered immediately. I assume that there is something in the API or a configurable vendor parameter that controls this behavior.
Any leads, tips will very appreciated.
Best
-F.

Thanks. Using MDB is not an option at this point.
In any event, the above post raise a good point. I expected that once the publisher sent the messages to the server that the server would push to all the clients -I assumed that to be default behavior of the JMS server. Is this correct?
Perhaps I'm issunderstanding the publish-subscribe architecture. I was not aware that client should be doing anything else other than listening for messages (which they are). Proof of that is that they "eventually" receive the messages.
I guess another way of reframing my problem is that I'm after a way that ensures that all messages are always pushed immediately to any listening client.
Best,
-F.

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