_TestPartial.cshtml

@DateTime.Now.Ticks

ExternalHelper.cshtml

@helper TestHelper() {
    {<text>@DateTime.Now.Ticks</text>}
}

HomeController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        //[OutputCache(Duration = 10)]
        public ActionResult Index()
        {
            return View();
        }

        [ChildActionOnly]
        public ActionResult TestPartial()
        {
            return PartialView("_TestPartial");
        }


        [OutputCache(Duration = 60)]
        [ChildActionOnly]
        public ActionResult TestPartialWithCache()
        {
            return PartialView("_TestPartial");
        }

    }
}

Index.cshtml

@using System.Diagnostics
@{
    ViewBag.Title = "Index";
}
@helper TestHelper() {
    {<text>@DateTime.Now.Ticks</text>}
}

<h2>Index</h2>

<h2>RenderPartial</h2>
<!--
@{var t1 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    Html.RenderPartial("_TestPartial");
}
@{t1.Stop();}
-->
<p>@t1.Elapsed @(t1.ElapsedMilliseconds / 1000.0) ms/call</p>


<h2>RenderAction</h2>
<!--
@{var t2 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    Html.RenderAction("TestPartial");
}
@{t2.Stop();}
-->
<p>@t2.Elapsed @(t2.ElapsedMilliseconds / 1000.0) ms/call</p>

<h2>RenderAction w/ OutputCache(Duration = 10)</h2>
<!--
@{var t3 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    Html.RenderAction("TestPartialWithCache");
}
@{t3.Stop();}
-->
<p>@t3.Elapsed @(t3.ElapsedMilliseconds / 1000.0) ms/call</p>


<h2>Inline</h2>
<!--
@{var t4 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    {<text>@DateTime.Now.Ticks</text>}
}
@{t4.Stop();}
-->
<p>@t4.Elapsed @(t4.ElapsedMilliseconds/1000.0) ms/call</p>


<h2>Helper</h2>
<!--
@{var t5 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    @TestHelper()
}
@{t5.Stop();}
-->
<p>@t5.Elapsed @(t5.ElapsedMilliseconds/1000.0) ms/call</p>


<h2>Helper (App_Code)</h2>
<!--
@{var t6 = Stopwatch.StartNew();}
@for (var i = 0; i < 1000; i++)
{
    @ExternalHelper.TestHelper()
}
@{t6.Stop();}
-->
<p>@t6.Elapsed @(t6.ElapsedMilliseconds/1000.0) ms/call</p>