Calculation Groups within Measure Calculations

Hi

I need some help with selectively applying calculation groups. In my data model, I have 5 types of measures:

Measure Type 1: measures where the calculation group should not be applied

Measure Type 2: measures where the calculation group should be applied

Measure Type 3: measures where a specific calculation item should apply, regardless of the calculation item selected

Measure Type 4: measures that are a calculation combining a measure type 1 and a measure type 3

Measure Type 5: measures that are a calculation combining a measure type 2 and a measure type 3

Measure Type 6: measures that combine two measures of type 3, where each has a different calcuation item applied

Up to now, I have been able to implement all measure types by using a disjointed table containing the same names as the calculation items and using the DAX TREATAS() function to selectively apply the calcuation group. However, TREATAS() comes with a significant performance cost, so I want to move away from TREATAS().

I have considered using a filter for SELECTEDMEASURENAME() but I suspect this would not work for measure types 3-6.

I'd appreciate any pointers as to what approach I can use to gain performance benefits but keep functionality.