Expression in SSRS Slowing down Report Rendering

Question

An expression in my report is making the report to run very slowly. The expression, set in a Row Column Visibility Property is like so:

    =IIF(Parameters!View.Value = 1 AND (Fields!PastVal.Value = 0)AND(Fields!DatePay.Value = 0) AND 
    (Fields!Line.Value = 0),True, IIF(Parameters!View.Value = 2 AND Fields!TaxPaid.Value = "N",True, False))

Now this expression returns the right result. The problem is that it makes the report run very slow.

To test it, I took off the expression and reports are displayed in less than 3 seconds but with the expression on, report takes over 50 seconds to run. Any help on this? Thanks.

Answer 1

Using This Query check Which Step taking time for Report Processing:

use ReportServer

select top 10 InstanceName,
                ItemPath,
                UserName,
                CAST((TimeDataRetrieval)as numeric(18,2))/60000 TimeDataRetrieval,
                CAST((TimeProcessing)as numeric(18,2))/60000 TimeProcessing,
                CAST((TimeRendering)as numeric(18,2))/60000 TimeRendering,
                CAST((TimeDataRetrieval+TimeProcessing+TimeRendering)as numeric(18,2))/ 60000 [Total_Time(Minutes)]
 from ExecutionLog3