Subtotal on all rows - Performance issue with ALL functions

Hello

I'm stuck in a problem which seems to me really simple .. 

MY NEED

I want a table with different level of aggregations but with the same KPI. 

I don't want a matrix because I want to see my subtotal of each row --> I need to send this excel's extraction to my suppliers without any change. 

I did a simple example : 

This is my current table. 
The finest level is Article so in my table my sales are splitted everywhere. 
But I want this : 

I want the subtotal for each Seller --> for example Jane sold 190€ and I want this subtotal on each row. Same for each area. 

SO What I did :

Sales_seller = 

CALCULATE 

( sum(Sales) , 

ALL (D_Article)

)

AND Sales_Area =

CALCULATE 

( sum(Sales) , 

ALL (D_Article), 

ALL (D_Seller)

)

Theoretically, this is working but in reality, the measure is too loud and my table never generating. 

I don't know how to do .. that seems so simple...  In excel we can do it in like 2 seconds.. 

I tried to do it with matrix and applied subtotals etc but this doesn't work because I need to export my data in excel and to see the total of each dimensions on each row. 

I hope this is quite clear..

Thank you by advance for your help