Finally, by a painful process of elimination, it turned out to be a block of code like this in the ASPX file. At render, it was deciding whether to include a custom UserControl. While the code executed properly, the only hint of a problem was iistrace showing “IISISAPI: ISAPI_END – IIS ends processing an ISAPI Request” taking a long time.

<% if( IsSomething ) { %>

    <%@ Register src="~/Sidebar.ascx" tagname="SiteSidebar" tagprefix="MySite" %>
    <MySite:SiteSidebar runat="server" />

<% } %>

If you want to save yourself hours of grief, don’t do this I wonder if this is the problem with a certain video player

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[WebMethod]
public Post[] GetPostsSince( int ThreadId, DateTime Since )
{ ... }

But sometimes the array actually has objects of the type Comment, that is a derived class of Post. When I tried tried it out, it threw this exception:

System.InvalidOperationException: There was an error generating the XML document. —> System.InvalidOperationException: The type Comment was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically.

The problem is that the Serializer doesn’t know about the Comment class until runtime, and it throws a tantrum. Luckily, the fix is just to put a directive in there to make sure it knows that the Comment class may be used.

In my case, I just added the XmlInclude directive right about my Post class declaration like this:

[Serializable()]
[XmlInclude( typeof( Comment ) )]
public class Post
{ ... }

And that did the trick! I hope this is helpful for someone else

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