Question

I’m looking for a way to track how long it took for a page to be generated by the server. I know I can use Trace to track this but I need a way to display this per page.

Its ASP.Net MVC 2

Answer 1

Yep the Derin Suggestion is the standard Way to do it in an ASP.NEt application, i would just suggest add an if so it does not interfere with non-HTML responses:
EDIT: added complete implementation

public class PerformanceMonitorModule : IHttpModule
{

    public void Init(HttpApplication context)
    {
        context.PreRequestHandlerExecute += delegate(object sender, EventArgs e)
        {
            //Set Page Timer Star
            HttpContext requestContext = ((HttpApplication)sender).Context;
            Stopwatch timer = new Stopwatch();
            requestContext.Items["Timer"] = timer;
            timer.Start();
             };
        context.PostRequestHandlerExecute += delegate(object sender, EventArgs e)
        {

            HttpContext httpContext = ((HttpApplication)sender).Context;
            HttpResponse response = httpContext.Response;
            Stopwatch timer = (Stopwatch)httpContext.Items["Timer"];
            timer.Stop();

            // Don't interfere with non-HTML responses
            if (response.ContentType == "text/html")
            {
                double seconds = (double)timer.ElapsedTicks / Stopwatch.Frequency;
                string result_time = string.Format("{0:F4} sec ", seconds);
                RenderQueriesToResponse(response,result_time);
            }
        };
    }
    void RenderQueriesToResponse(HttpResponse response, string result_time)
    {
        response.Write("<div style=\"margin: 5px; background-color: #FFFF00\"");
        response.Write(string.Format("<b>Page Generated in "+ result_time));
        response.Write("</div>");
    }
    public void Dispose() { /* Not needed */ }
}

you can also add some style to it…

And remember to register your Module in WebConfig inside httpModules Section:

  <add name="Name" type="namespace, dll"/>

For a Complete Reference about this check the Pro ASP.NET MVC Framework by Steven Sanderson – Chapter 15 – Performance, Monitoring Page Generation Times.

EDIT:(comment @Pino)
Here is the example for my project:
alt text http://www.diarioplus.com/files/pictures/example_performance.JPG