Oracle SOA 11g Mediator performance query

Hi,
Currently, in our project, we use multiple mediators for routing. There are no transformations or assignment of variables in the mediator. Whatever comes as input to the mediator, is sent to the target (reference).
How does the message in the $in variable of the mediator get mapped to the $out variable. I didnot explicitly mention that $in should be mapped to $out.
Below is the routing rule in the mediator plan which is working well.
<case executionType="queued" name="Test.execute">
            <action>
               <invoke reference="Test" operation="execute"/>
            </action>
</case>
I heard that the mediator internally maps every tag from $in variable to $out variable through the transformation engine. This would impact the performance.
Instead, if we do an assign in every routing rule with $in = $out, it will not do field to field mapping and performance would be good.
Can anyone let me know if this is true and how much performance(in terms of percentage) can be improved, by explicitly using assign.

Always raise a case with Oracle Support for such issues.
Regards,
Anuj

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