Can this be optimized further?

Summary: Hey All, just wondering if this can still be optimized without changing some of the parents to Dynamic Calc?. My Aggregation rule for actual data is taking approximately 10-15mins. I tried to use fixparallel and It reduced the run time by a few minutes but the Subsidiary dimension did not aggregate to parent level. Thanks in advanced!

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10mins runtime

SET AGGMISSG ON;
SET UPDATECALC OFF;
SET EMPTYMEMBERSETS ON;

FIX(&PriorYr:&LastClosedYr, "Actual", "Base",@Relative("Amount",0))