Roll up in DAX

Hi, 

Is there any other way that we could acheive the similar functionality specified in the below measure becuase this measure is taking quite a long time to run in the visual.  

Sales Amount All Up =
CALCULATE (
    [Sales Amount],
    FILTER ( ALL ( 'Product'[Class] ), [Sales Amount] ),
    FILTER ( ALL ( 'Date'[Fiscal Month] ), [Sales Amount] )
)

Thanks in Advance.