DAX measure : difference between 2 columns row by row

[Easy_E]

Hi everyone, 

I am struggling with to create a measure. I need to compute the difference between 2 values in two different columns. I created a calculated column wich serves the purpose but it slows down my model (see below).

Is there some way to use a DAX measure to do the same computing without creating a calculated column ?

Thanks in advance ! 

[SpartaBI · Accepted solution]

@Easy_E 
MEASURE = SUMX(Table,Table[Column1] - Table[Column2])

Regarding the SUMX it depends on what you want to show on the total. If it's summing them than SUMX, if it's averaging them than AVERAGEX etc