Reg: Query Performence

Below query output results time taking very much.

SELECT NON EMPTY

{[Measures].[Score]} ON COLUMNS,

NON EMPTY {

(DESCENDANTS({[Organisation].[Organisation].&[36]},0),

[Question].[Type Id].[Category Id],

[Question].[Type Description].[Category Description],

[Question].[Short Description].[Short Description]

)}

HAVING [Measures].[Points]>0 ON ROWS

FROM (SELECT [Assignment].[Id].&[1] ON COLUMNS

FROM [Sample])

Total 7 dimensions 2 measure groups

Fact Table : 18,000,00 Records

Dimensions: 2000 Records

[Organisation].[Organisation] having 9 levels

like

Level1

Level2

LEVEl3

Is there any solution to improve the query performence.Any steps to inreasing performence of cube. Please help me. this is urgent for me

Could you please rewrite your query in terms of AdventureWorks?