Yes!! I can do it now.
Because my SAP/BW Cube have 10 Dimension and 2 Measure
and when connected i will Select "Hide" on fields if i don't use it.
But It use more 1 Hour for run Extract
Today i test by Create Bex Query to That cube and Select Just field i use
and clear anything in "Free Characteristics" Panel then save to "Billing_test_query"
and Connect to that Bex Query instead. (Ref "Connect to Bex.png")
It Success in 5 Sec lol!!
i think the Core of Problem is the Tableau MDX not Dynamic with "Hide" Field