SSRS parameters

Hi to all

I use SSAS - SSRS 2014 Standard BI Edition... (in future we are planning migration to SQL SERVER 2017 Enterprise edition)

I have some reports connected to a OLAP Cube.

I have some reports that are very slow to visualize members from dataset parameters...

If i build a report with 4 or 5 parameters , it needs so much time to query each dataset parameter.

I know it depends on the fact that some dimension contains some thousands of members...

In some case i use appropriate cubes roles , to limit memebers , but it is not allways possibile.

What can i do ???

What are tecniques most frequently used from ssrs OLAP CUBES developers ???

I tried also to customize query dataset parameters using cascading parameters to limit numbers of members  .. but it is not so easy ,, MDX is very hard for me...

Any suggestions ??? Any useful articles or samples ???? Other tecniques ???

Is it only fault to large numbers of members ???

I put here a  query dataset parameters.for my reports ..

In this report i have 4 visible parameters.

1) @FromCalendarioDataAAAAMMGG    a date

2) @ToCalendarioDataAAAAMMGG      a date

3) @FornitoreGruppoClasseScontoFornitore   to specify a supplier code

4) @ClienteIngrosso     to specify a customer code  

Thanks in advance...

Query Dataset parameter 4) @ClienteIngrosso      

WITH MEMBER [Measures].[ParameterCaption] AS [Clienti_Ingrosso].[Codice Descrizione Responsabile].CURRENTMEMBER.MEMBER_CAPTION

        MEMBER [Measures].[ParameterValue] AS [Clienti_Ingrosso].[Codice Descrizione Responsabile].CURRENTMEMBER.UNIQUENAME

MEMBER [Measures].[ParameterLevel] AS [Clienti_Ingrosso].[Codice Descrizione Responsabile].CURRENTMEMBER.LEVEL.ORDINAL

SELECT {[Measures].[ParameterCaption],

             [Measures].[ParameterValue],

            [Measures].[ParameterLevel]} ON COLUMNS ,

           [Clienti_Ingrosso].[Codice Descrizione Responsabile].ALLMEMBERS ON ROWS

        FROM ( SELECT ( STRTOMEMBER(@FromCalendarioDataAAAAMMGG, CONSTRAINED) : STRTOMEMBER              (@ToCalendarioDataAAAAMMGG, CONSTRAINED) ) ON COLUMNS

       FROM ( SELECT ( STRTOSET(@FornitoreGruppoClasseScontoFornitore, CONSTRAINED) ) ON COLUMNS

      FROM ( SELECT ( { [TipoProdotto].[TipoProdotto].[Idtipo Prod].[Prodotto] } ) ON COLUMNS

      FROM ( SELECT ( { [TipoStatistica].[TipoStatistica].[Flag Stat].[Statistica Standard] } ) ON COLUMNS

       FROM ( SELECT ( { [Configurazione].[Configurazione].[Cod Config].[Consegnato] } ) ON COLUMNS

FROM [VenditeIngrosso])))))