If you're running CICS/TS 2.2 or later the CPU in the open (L8) TCB's is included in USRCPUT. However, there is a great deal of overhead involved in function shipping to a file-owning region (FOR) depending on the type of file processing your application performs. Not only is there additional CPU in the AOR as it packages up the request, the FOR has to spend time attaching tasks and returning the requested record.
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