SSRS 2008 Filter or Orcle Where clase in SSRS report for applying filter .

Hi team ,

i have applied filter on Oracle (where clase ) and passinng parameter from asp.net page and

only using ssrs for showing report there is no filter apply

i have apply all filter on Orcle side as where clause .

and its come directly as parameter in report but there is no fliter apply on report level

i need to uderstand abt tuning performance

is better for tunnig or not?

or

i need to add filter on report level for performance

please resolve 

thanks

Abhishek