PJI is CPU intensive operations indicator.
As you say, you have a lot of CASEs, which may be at the botom of your problems.
Complex operations may also be CPU intensive and show as high PJI.
Others causes may be:
Duplicate row checks in SET tables,
Many duplicate row hashes in NUPIs.
Agregations, functions (SUBSTR, INDEX...) arithmetic operations...
HTH.
Cheers.
Carlos.
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