Report is not running fast? - reporting-services

I have two report say Report A and Report B. When I am running two report independently it is running fine. But when I am using Report B as Sub report in Report A. It is not performing well in term of speed.

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Can I identify Sub Reports running in the report server SSRS?

Is there a way of querying and identifying all the sub reports that have run (or failed) in the report server?
I have a few sub reports that create 1 master report, I can see the run details for the master report but not for the sub report. Is this possible?
Thanks

SSRS subtotals different in Report Preview vs when Deployed

If I run a report within SSRS developer, I show no subtotals in specific rows, exactly as it should because there is nothing to subtotal. However, if I deploy the report, those same rows have an erroneous subtotal in them. I ensured I deployed and ran the correct report. I even deleted the report and re-deployed. I need to correct this because it is an important report that gets emailed to the entire company.
I believe This is very classic case of Data been saved as Cache in your local System. But when you deploy the Report, there is actual Data available on application.
What you need to do is delete this FileName.rdl.data file and try your report again in Developer, it should get update data from application

Report Builder / BIDS - Running specific datasets only via parameter

We have a lot of reports delivered via SSRS.
We are now looking to consolidate these reports into 'packs' so that multiple reports will actually run in one .rdl.
We are using a separate dataset for each report and are looking to use a parameter to select which reports are run (i.e. which datasets to run)
Does anyone have any guidance on this, i would like to avoid using sub reports if possible.

Performance issue in SSRS Report in Test Server?

I have query it contains 45,611 rows which executes in SSMS (Sql Server Management Studio) 2008 R2 in 2 sec.
In SSRS ,When i preview the report it will takes 6 sec,
After i deployed the same report and configure ASP.Net application here also it will takes same as 6 sec.
Next I published report in Test Server (same no of records),here it will takes more time like 30 sec .
See Here My Report is DrilDown in Chart Reports
How will i do to improve the performance ?
Because, While you browse Report from SSRS, SSRS Reports needs to be Fetched into HTML that why it is taking extra time.
What i want to Suggest you is that : [Im supposing you are using ASP.NET]
You can Request the Report from Report Server.
Then, You can give the Output as an PDF Document.
Which will save the Time for Record Fetching (a Huge Table) as an HTML Table.
Hope You understand.

ssrs 2008 R2 Main Report Deployment without Subreports

I prepared a report. I have used 15 subreports for the main report. When I deploy my report then all the subreports are also deployed in the Report Manager. I just want to see Main Report in the Report Manager instead of all reports. The snapshots are below. Is there any way advise me?
You'll need to go to the properties of the sub reports and hide them in tile view. You can't actually completely hide them but this will hide them from most users.