XML Publisher OPP timeout on bigger server

Question

I am using xml publisher 5.6.3 in apps 11.5.10CU2. On my dev environment it works ok. In my UAT environment which is a much bigger server with shared appl top even the simplest query is timing out.
eg. created following data template and simple rtf template to display the 1 field. On dev box it completes in around 1 sec but in UAT it times out after 4 mins.
<?xml version="1.0" encoding="UTF-8" ?>
- <dataTemplate name="XML_PUB_SPEED_TEST" defaultPackage="" description="XML Publisher Speed Test" Version="1.0">
- <dataQuery>
- <sqlStatement name="Q1">
- <![CDATA[ SELECT  sysdate from dual
  ]]>
</sqlStatement>
</dataQuery>
- <dataStructure>
- <group name="G_TIME" source="Q1">
<element name="CURRENT_TIME" value="SYSDATE" />
</group>
</dataStructure>
</dataTemplate>
I have raised a TAR, but at the moment waiting to get Oracle support to understand that there is no point increasing the timeout on UAT system since if I cant get this query to work quickly a real xml publisher report has no chance.
I have the same speed problems with Oracle supplied XM L publisher reports eg. GL

Answer 1

Managed to get a bit further. When the conc manager request is run on the physical node then everything works ok (doesn't matter whether the OPP runs on the physical or resouce (virtual) node)
My problem with this is that I have had to set up a new conc manager to process this request and exclude the program from all the other conc managers which will be a real pain if we want to start using xml publisher more widely including use of core reports that Oracle is converting into XML Publisher format