Replacement path in formula variable performance

Hello Gurus,

I have a report where in I need to calculate a KF based on the master data attribute value.

For instance, 0JOB is the master data and ZSTAFF_CLASS is an attribute(Navigational) to this Characteristics.

Now based on certain value of ZSTAFF_CLASS, I need to build a formula.

I created a Formula Variable with replacement path of 0JOB and replaced by the attribute value of ZSTAFF_CLASS this give the output. But it runs for several minutes if I try to see the output having large dataset.

My question is there any way to get the attribute value, in a way that does not kill the performance ?

Regards,

Sonal