Prevent IIS from serving static files through ASP.NET pipeline

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I’m taking a guess here and suspect that you have the following setting configured in your web.config file:

<modules runAllManagedModulesForAllRequests="true">

This means that every request, including those for static content is hitting the pipeline.

Change this setting to:

<modules runAllManagedModulesForAllRequests="false">

This is assuming your application is running under ASP.NET 4.0 and MVC3.

For this to work you need to install KB980368 (requires a reboot) or Windows 2008R2 SP1 (which includes this hotfix). The reason for this is explained in this excellent article:

How ASP.NET MVC Routing Works and its Impact on the Performance of Static Requests

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