regarding performance for local variable

A Score Level 1

Hi All

In 1st local variable i am calling an exprission rule and getting the data 

In 2nd local variable i am using UNION(local!associatedCompanies1,local!associatedCompanies1)

but why the execution time is more for 2nd variable 

I thing this expression rule is calling second time in 2nd variable

can any one tell me why it is happning 

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