How does calculation time depend on 'IF' condition

[cena_abhishek]

How does my calculation time of a measure depend on nested 'If' statement?

I have expressions which have atleast 4 nested 'If' statements. I want to know how does calculation time depend on nested 'If'?

[Anil_Babu_Samineni]

May be this?

If(FieldName = 'A', Sum(Sales),

     If(FieldName = 'A1', Sum(Sales1),

          If(FieldName = 'A2', Sum(Sales2),

               If(FieldName = 'A3', Sum(Sales3)

                 )

             )

        )

  )