Consuming queue from multiple processes

We have a program designed to consume a queue with consumer name set to "consumer". Here's how it dequeues messages:
dequeue_options.consumer_name := 'Consumer';
dequeue_options.navigation := DBMS_AQ.FIRST_MESSAGE;
dequeue_options.WAIT := 10;
DBMS_AQ.DEQUEUE(queue_name => 'ourschema.our_que',
dequeue_options => dequeue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
If we run one instance of this program this dequeue operation above uses 10 CPU seconds over the duration of our load test. If we run two instances of the program (which consumes the same queue as the same consumer) then the dequeue operation above uses 160 CPU seconds. We need the second instance to remove a single point of failure but the 16 fold increase in load on our database is not acceptable for a dequeue operation.
Why is it so expensive to have two processes dequeuing from our_queue using the same consumer name?
thanks
Dale

We managed to solve the problem.
We had initiated a transaction to bracket the dequeue and a subsequent insert. Removing the transaction seems to have removed the performance hit from the second process.

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Hi,
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exec DBMS_AQADM.GRANT_TYPE_ACCESS ('system');
create type Change_History_Trigger_Data as object(Col1 VARCHAR2(255), Col2 VARCHAR2(128), Col3 VARCHAR2(255), Col4 TIMESTAMP, Col5 VARCHAR2(64), Col6 VARCHAR2(64), Col7 NUMBER(8));
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ORA-06512: at "SYS.DBMS_AQADM", line 58
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Problem solved.
The queue name was too long. Found a post with the same problem.
Re: Create Queue Table ORA-00600 while dbms_aqadm.create_queue_table
thanks anyway

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http://docs.oracle.com/cd/E23943_01/apirefs.1111/e13951/mbeans/DistributedQueueBean.html?skipReload=true#ForwardDelay
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Hi There,
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...the "button" is using a page level Target,...
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