just my 2ct, to add to previous responders replies:
In your sproc, chances are filter arguments aren't sniffed to your advantage at query plan generation time.
Reason for that is you are parsing and completing the filter arguments within the sproc itself.
Try handing there parameters over as needed by the sproc itself.
i.s. try writing your sproc so it accepts the needed filter data as input paramters and see how that influences the query plan.
It may even be enough to add 'with recompile' to the detail query ( please implement the grouping and union all advice )
Johan
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