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POASP.NET_SessionId cookie slows down web server on multiple GET requests
 

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    <p>I am testing my ASP.NET MVC2 web application using MS VisualStudio 2010 Express and the ASP.NET Development server on <a href="http://localhost" rel="nofollow">http://localhost</a>. The ASP.NET Framework is version 4.</p> <p>I have a page with a list of images that are retrieved through an Action method as follows:</p> <p>[HTML code]</p> <pre><code>&lt;img src="/images/thumb_79c7b9f0-5939-43e5-a6d0-d5e43f4e8947.jpg" alt="image"&gt; </code></pre> <p>[Routing configuration in Global.asax.cs]</p> <pre><code>public class MvcApplication : System.Web.HttpApplication { public static void RegisterRoutes(RouteCollection routes) { routes.MapRoute( "Image", "images/{id}", new { controller = "Image", action = "Picture", id = "" } ); // [...] other routing settings } } </code></pre> <p>[Image Controller]</p> <pre><code>public class ImageController : Controller { [AcceptVerbs(HttpVerbs.Get)] public ActionResult Picture(string id) { try { return File(ImageBasePath + id, "image/jpeg"); } catch (Exception) { } } private string ImageBasePath { get { return HttpContext.Request.PhysicalApplicationPath + WebConfigurationManager.AppSettings["dbImageBasePath"]; } } } </code></pre> <p>In practice, the Picture action method performs other checks before returning the image and this is the reason why I return the image through an action method.</p> <p>The problem here is that when there is no session in place (i.e. the ASP.NET_SessionId cookie doesn't exist for localhost) the time for the browser to get the images is very short (~10ms) while when ASP.NET_SessionId cookie does exist, the time jumps to 500ms-1s. This happens on any browser.</p> <p>I've done various tests and I saw that if I get the images without passing through the ASP.NET application, the ASP.NET_SessionId cookie doesn't affect the loading time.</p> <p>It looks like multiple HTTP GET requests with an ASP.NET_SessionId cookie passed to the web application slow down considerably the application itself.</p> <p>Does anyone have an explanation for such a strange behavior?</p> <p>Many thanks.</p> <p>UPDATE The problem described above occurs on a IIS7 web server as well, so it is not specific to the local ASP.NET Development server.</p>
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