SSRS Subreport - Renders very slow

Hi All,
I have a subreport which is embedded in the main report (form report) which is inturn embedded in a list. The report is executed for different levels with each level having different number of records (say 100, 150, etc.) and gives us a form for each
of the records on a single page. That is the report will have 150 pages for 150 records. My subreport renders very fast when it is run stand alone. Even the SPs written for the subreport are giving results within seconds. But when embedded in the main
report, the whole report is rendering very slow.
I tried passing the parameters to the subreport in two different ways:
1. Assigned the main dataset's record id to the subreport which gives correct data but taking very long time to generate the report.
2. Assigned the main dataset's record id to a hidden parameter and passing that parameter to the subreport as a parameter. This way the report renders very fast but the subreport is always giving the results for the first record id. That is even for the
second record, the subreport is showing up the first record's details which is incorrect.
Have been struggling with this issue for a while. Request you to help me in this regard.
Regards,
Bala.

Hi Bala,
According to your description, it seems that the issue is caused by the parameters. Please check the parameters setting of each subreport control in the main report. Make sure the data types are the same between the parameters, and the values passed to the
subreport parameters are correct.
As to the report performance, we can refer to the ExecutionLog View to monitor it. The total time to generate a reporting server report (RDL) can be divided into 3 elements:
Total time = (TimeDataRetrieval) + (TimeProcessing) + (TimeRendering)
For more details about troubleshooting report performance, please refer to the following documents:
http://technet.microsoft.com/en-us/library/bb522806(v=sql.105).aspx
http://blogs.msdn.com/b/robertbruckner/archive/2009/01/05/executionlog2-view.aspx
Hope this helps.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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