FIX: It takes longer time than usual to render a report in SSRS 2012 or SSRS 2014

Symptoms
Assume that you render a report in Microsoft SQL Server 2012 Reporting Services (SSRS 2012) or SSRS 2014, and that the report has some small errors, for example:
library!ReportServer_0-8!4798!12/16/2014-16:33:01:: i INFO: RenderForNewSession('/MyReport')
processing!ReportServer_0-8!4798!12/16/2014-16:33:03:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: , Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: There is no data for the field at position 8.;
processing!ReportServer_0-8!4798!12/16/2014-16:33:33:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: , Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: There is no data for the field at position 9.;
In this situation, the report runs successfully. However, it might take longer time than usual to render the report. Each error may cause a 30-second delay.
Cause
This issue occurs because Reporting Services is blocked from loading the unnecessary error-handling object.
Resolution
This issue was first fixed in the following cumulative update of SQL Server.

Cumulative Update 1 for SQL Server 2014 SP1

Cumulative Update 5 for SQL Server 2012 SP2

Cumulative Update 6 for SQL Server 2014

Cumulative Update 14 for SQL Server 2012 SP1

About cumulative updates for SQL Server

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 3028322 - Last Review: 06/22/2015 14:22:00 - Revision: 5.0

Microsoft SQL Server 2012 Service Pack 1, Microsoft SQL Server 2012 Service Pack 2, SQL Server 2012 Reporting Services, Microsoft SQL Server 2014 Service Pack 1, SQL Server 2014 Reporting Services

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