Dynamic Measure with Visual Filter - How Power BI works?

Hi All,

I have a question with regards to creating a dynamic measure which inturn has multiple measure calculations happenning within it.

The way the dynamic measure is used in the report is, one of the values of the measure is used as "visual filter" while the other value is used as value in the visual. 

The below is the dynamic measure I am referring to:

DynamicScore =
VAR mindate = [minDateACI]
VAR maxdate = [maxDateACI]

VAR Cleanliness =
CALCULATE( SUMX( stn_data, stn_data[score] * stn_data[weight] ) )
/ CALCULATE( SUM( stn_data[weight] ), stn_data[score] <> 0 && NOT ( ISBLANK( stn_data[score] ) ) )

VAR CleanlinessTD =
CALCULATE(
Cleanliness
, DATESBETWEEN(stn_data[srDate]
, mindate, maxdate)
)

VAR Arrival =
CALCULATE( SUMX( stn_data, stn_data[score] * stn_data[weight] ) )
/ CALCULATE( SUM( stn_data[weight] ), stn_data[score] <> 0 && NOT ( ISBLANK( stn_data[score] ) ) )

VAR ArrivalTD =
CALCULATE(
Arrival
, DATESBETWEEN(stn_data[srDate]
, mindate, maxdate)
)

VAR FinalTd =
UNION
(
ROW("ItemName","Cleanliness" ,"ItemValue",CleanlinessTD),
ROW("ItemName","Arrival" ,"ItemValue",ArrivalTD)

RETURN FinalTd

When it comes to visualization, the "Item Name" is used in Visual Filter for a Card and ItemValue is used as the value of that card.

I have two cards, one for Cleanliness and one for Arrival. So, for the respective cards, the visual filter is selected to either Cleanliness or Arrival.

Now, coming to main Question, when Power BI Report runs, the same "dynamic" measure is called for both cards. My understanding is, when the measure is executed, both the measures are "calculated" by Power BI but when it comes to visual filter, out of the measures, it only selects the "filtered" value to show.

Technically speaking, the measures are calcualted twice (once for each card) and filtered to "selected item name". 

Is that the right understanding or Power BI does it differrently?

Thanks,

Vikram