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My site loads very slow. I have enabled Failed Request Tracing to trace status 200 pages. When I view the trace, I notice that following setting the response header takes a long time:

GENERAL_SET_RESPONSE_HEADER HeaderName="X-AspNetMvc-Version", HeaderValue="5.1", Replace="false" 17:06:20.608

GENERAL_SET_RESPONSE_HEADER HeaderName="X-Frame-Options", HeaderValue="SAMEORIGIN", Replace="false" 17:06:23.686

GENERAL_SET_RESPONSE_HEADER HeaderName="Cache-Control", HeaderValue="private", Replace="true" 17:06:44.826

Can someone explain what is going on here? And how to fix this?

I am running a 4.5.1 application on IIS 8.5

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Martijn
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