Unit Of Order reducing the performance after some threshold limit

Hi,
Our application is doing netting of trades.
We are using UOO for posing messages to JMS queues appended to it.
From this message, we are extracting the trade info and persisting into DB.
When MDB is listening to that JMS queue, application is performing well when the no. of messages in the queue is <5000.
when this number increases lets say 20000, our application is performing very badly.
We are using 64 instances of MDB connecting to queue.
What are the parameters reduce the performance of the MDB consuming the messages?
Can you please help me on this?
Thanks,
Ravikumar

An increasing backlog is a sign that your MDBs are not keeping up with your senders.
See:
Tuning WebLogic JMS
http://docs.oracle.com/cd/E17904_01/web.1111/e13814/jmstuning.htm#PERFM294
and
Tuning Message-Driven Beans
http://docs.oracle.com/cd/E17904_01/web.1111/e13814/mdbtuning.htm#PERFM271

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Unit Of Order reducing the performance after some threshold limit

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