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Article ID: 961884 - Last Review: August 4, 2010 - Revision: 4.0

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After you change the App_Code folder, the bin folder, or the Global.asax file in a Microsoft ASP.NET Web application, you may experience very slow performance on an initial request to the Web site.


This problem occurs because after you change the App_Code folder, the bin folder, or the Global.asax file, everything will be recompiled. If the application is very large, the compilation can take a long time. Therefore, Web clients will be slow to load Web pages on the initial request to the Web site.


Hotfix Replacement Information

The hotfix that corresponds to KB961884 has been superseded with the hotfix KB981201, which contains all fixes that were previously included in KB961884.  You should use the hotfix KB981201 to fix the issues described in KB961884. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
981201  ( ) A hotfix is available for ASP.NET 2.0 that enables support for extended protection


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about ASP.NET compilations, visit the following Microsoft Developer Network (MSDN) Web sites: ( (
For more information about the configure compilation element in ASP.NET settings, visit the following MSDN Web site: (

  • Microsoft ASP.NET 2.0
  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 3.5 Service Pack 1
kbhotfixserver kbexpertiseadvanced kbqfe kbsurveynew KB961884
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