2014 SSRS Reports Performance issues

Hi All,
After upgrading SQL 2008 reports to SQL 2014 i observed there is performance lag in 2014 ssrs reports,
2008 reports which used to render in <2 secs now taking >50 secs,
After doing some checks on why this lag occurred, i found that this is because of the expressions in reports, If i remove all the expressions then report renders < 2 secs otherwise its taking >50 secs
My question here is, we used the same expressions in 2008 version also which displays the report in <2 secs but why same thing taking more time in 2014 version.
Is expressions handling in 2008 and 2014 different.
and below are the expressions used in the both the versions
IIF(ISNOTHING(Fields!Comp.Value),"-",Fields!Comp.Value)
IIF(ISNOTHING(Fields!Base.Value),"-",Fields!Base.Value)
IIF(ISNOTHING(Fields!Var.Value),"-",Fields!Var.Value)
iif(Fields!check.Value=true,"yellow","Transparent")
Thanks in advance
Chandra.

Hi Chandra,
According to your description, the same report render slower in SQL Server 2014 than in SQL Server 2008.
In both SSRS 2008 and SSRS 2014, the expression is processed in the same way. In Reporting Services, the total time to generate a report include TimeDataRetreval, TimeProcessing and TimeRendering. To analyze which section take much time, we can check the
table Executionlog3 in the ReportServer database. For more information, Please refer to this article:
More tips to improve performance of SSRS reports.
After check out which section costs most of time, then you can refer to this article to optimize your report:
Troubleshooting Reports: Report Performance.
If possible, please share some information about your report migration.
Best regards,
Qiuyun Yu
Qiuyun Yu
TechNet Community Support

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