Analysis :: Count Function Taking More Time To Get Count From Parent Child Dimension?

below data,

Countery
parentid
CustomerSkId
sales

A
29097
29097
10

A
29465
29465
30

A
30492
30492
40

[code]....
 
Output

Countery
parentCount

A
8

B
3

c
3

in my count function,my code look like,

 set buyerset as exists(dimcustomer.leval02.allmembers,custoertypeisRetailers,"Sales")
set saleset(buyerset)
set custdimensionfilter as {custdimensionmemb1,custdimensionmemb2,custdimensionmemb3,custdimensionmemb4}
set finalset as exists(salest,custdimensionfilter,"Sales")
Set ProdIP as dimproduct.dimproduct.prod1
set Othersset as (cyears,ProdIP)
(exists(([FINALSET],Othersset,dimension2.dimension2.item3),[DimCustomerBuyer].[ParentPostalCode].currentmember, "factsales")).count

it will take 12 to 15 min to execute.