Need to optimize MDX Query - optimization

Question

I have built this query through BIDS Query Designer. But I want to optimize this query by removing SELECTS inside outermost FROM Clause and having only cube in from clause and rest filter on where or filter clause:
SELECT { [Measures].[User ID Distinct Count], [Measures].[Post Count], [Measures].[Like Count], [Measures].[Comment Count], [Measures].[Impressions Master Count] } ON COLUMNS,
NON EMPTY { ([Section Master].[Section Name].[Section Name].ALLMEMBERS * [Post Master].[Post Name].[Post Name].ALLMEMBERS * [Post Master].[SP Insert Date].[SP Insert Date].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS
FROM ( SELECT ( STRTOSET(#SectionMasterSectionName) ) ON COLUMNS
FROM ( SELECT ( STRTOMEMBER(#FromDimDateDate) : STRTOMEMBER(#ToDimDateDate) ) ON COLUMNS
FROM [AnalyticsCube]))
CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS
I am quite new in MDX and don't know much in regards to MDX query optimization. And Because of that I also don't know that this is the Optimized version of query or there is still scope for optimization in this. My cube structure is shown in Image.
I have Update my old query by doing some changes in Row and Column Part, but still stuck with From Clause part
SELECT { [Measures].[User ID Distinct Count],
[Measures].[Post Count],
[Measures].[Like Count],
[Measures].[Comment Count],
[Measures].[Impressions Master Count] } ON COLUMNS,
NON EMPTY { ([Section Master].[Section Name].CHILDREN) *
([Post Master].[Post Name].CHILDREN, [Post Master].[SP Insert Date].CHILDREN ) } ON ROWS
FROM ( SELECT ( STRTOSET(#SectionMasterSectionName) ) ON COLUMNS
FROM ( SELECT ( STRTOMEMBER(#FromDimDateDate) : STRTOMEMBER(#ToDimDateDate) ) ON COLUMNS
FROM [AnalyticsCube]))

Answer 1

This would be the initial simplification:
SELECT
{
[Measures].[User ID Distinct Count]
,[Measures].[Post Count]
,[Measures].[Like Count]
,[Measures].[Comment Count]
,[Measures].[Impressions Master Count]
} ON COLUMNS
,NON EMPTY
{
[Section Master].[Section Name].Children
*
(
[Post Master].[Post Name].Children
,[Post Master].[SP Insert Date].Children
)
} ON ROWS
FROM
(
SELECT
StrToSet(#SectionMasterSectionName) ON 0,
StrToMember(#FromDimDateDate) : StrToMember(#ToDimDateDate) ON 1
FROM [AnalyticsCube]
);
Then it seems odd to me that you don't move StrToSet(#SectionMasterSectionName) into the main SELECT clause:
SELECT
{
[Measures].[User ID Distinct Count]
,[Measures].[Post Count]
,[Measures].[Like Count]
,[Measures].[Comment Count]
,[Measures].[Impressions Master Count]
} ON COLUMNS
,NON EMPTY
{
StrToSet(#SectionMasterSectionName)
*
(
[Post Master].[Post Name].Children
,[Post Master].[SP Insert Date].Children
)
} ON ROWS
FROM
(
SELECT
StrToMember(#FromDimDateDate) : StrToMember(#ToDimDateDate) ON 0
FROM [AnalyticsCube]
);
Logically it is slightly different but you could then think about using a WHERE clause rather than a SUB-SELECT:
SELECT
{
[Measures].[User ID Distinct Count]
,[Measures].[Post Count]
,[Measures].[Like Count]
,[Measures].[Comment Count]
,[Measures].[Impressions Master Count]
} ON COLUMNS
,NON EMPTY
{
StrToSet(#SectionMasterSectionName)
*
(
[Post Master].[Post Name].Children
,[Post Master].[SP Insert Date].Children
)
} ON ROWS
FROM [AnalyticsCube]
WHERE
StrToMember(#FromDimDateDate) : StrToMember(#ToDimDateDate);