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Tips and Tricks on how to improve MVC Application Performance

In this post we will cover a few tips and tricks to improve ASP.NET MVC Application Performance.

Run in Release mode

Make sure your production application always runs in release mode in the web.config
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<compilation debug="false"></compilation>
or change this in the machine.config on the production servers
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<configuration>
    <system.web>
          <deployment retail="true"></deployment>
    </system.web>
</configuration>

Only use the View Engines that you require

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protected void Application_Start()
{
    ViewEngines.Engines.Clear();
    ViewEngines.Engines.Add(new RazorViewEngine());
}

Use the CachedDataAnnotationsModelMetadataProvider

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ModelMetadataProviders.Current = new CachedDataAnnotationsModelMetadataProvider();

Avoid passing null models to views

Because a NullReferenceException will be thrown when the expression gets evaluated, which .NET then has to handle gracefully.
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// BAD
public ActionResult Profile()
{
    return View();
}
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// GOOD
public ActionResult Profile()
{
    return View(new Profile());
}

Use OutputCacheAttribute when appropriate

For content that does not change often, use the OutputCacheAttribute to save unnecessary and action executions.
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[OutputCache(VaryByParam = "none", Duration = 3600)]
public ActionResult Categories()
{
    return View(new Categories());
}

Use HTTP Compression

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<system.webserver>
<urlcompression dodynamiccompression="true" dostaticcompression="true" dynamiccompressionbeforecache="true"></urlcompression>
</system.webserver>

Remove unused HTTP Modules

If you run into any problems after removing them, try adding them back in.
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<httpmodules>
      <remove name="WindowsAuthentication"></remove>
      <remove name="PassportAuthentication"></remove>
      <remove name="Profile"></remove>
      <remove name="AnonymousIdentification"></remove>
</httpmodules>

Flush your HTML as soon as it is generated

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<pages buffer="true" enableviewstate="false"></pages>

Turn off Tracing

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<configuration>
     <system.web>
          <trace enabled="false"></trace>
     </system.web>
</configuration>

Remove HTTP Headers

This is more of a security thing
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<system.web>
    <httpruntime enableversionheader="false"></httpruntime>
</system.web>
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<httpprotocol>
 <customheaders>
  <remove name="X-Powered-By"></remove>
 </customheaders>
</httpprotocol>

Uninstall the URL Rewrite module if not required

This saves CPU cycles used to check the server variable for each request.
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Go to "Add or Remove Programs" and find "Microsoft URL Rewrite Module" and select uninstall.
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