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Home/ Questions/Q 6242865
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T12:02:02+00:00 2026-05-24T12:02:02+00:00

In Process Explorer, I see that IIS is loading the native versions of some

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In Process Explorer, I see that IIS is loading the native versions of some of the System DLLs instead of the regular managed ones.
For example, I see Microsoft.JScript.ni.dll, System.Data.ni.dll, mscorlib.ni.dll and a couple more.

At no point did anyone run ngen on this server.

It’s Windows 2008 R2.

What could be causing this?

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  1. Editorial Team
    Editorial Team
    2026-05-24T12:02:05+00:00Added an answer on May 24, 2026 at 12:02 pm

    ngen is run when the framework is installed. These are commonly used assemblies so .net assumes you’ll be using them & optimises it’s for you.

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