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Q:

How can I cache layouts in Sitecore? 

A:

Layouts in Sitecore can be cached in the following way:

1. Turn off browser cache disabler: <setting name="DisableBrowserCaching" value="false"/>
    
2. Add "<%@ OutputCache Duration="100" VaryByParam="none" VaryByCustom="itempath" %>" to your layout source.
    
3. Add the following code to global.asax:
    
   public override string GetVaryByCustomString(System.Web.HttpContext context, string arg)
   {
   string result = string.Empty;
   
   if ((Sitecore.Context.Item != null) && (arg == "itempath"))
               {
   result = "_#itempath:" + Sitecore.Context.Item.Paths.Path.ToString();
               }
   else
               {
   result = base.GetVaryByCustomString(context, arg);
   }
    
   return result;
   }
     
4. Comment out the SaveFormAction processor in the web.config file:
   <!-- <processor type="Sitecore.Pipelines.HttpRequest.SaveFormAction, Sitecore.Kernel"/> --> 
   Please note that this setting is already commented out in Sitecore 5.3.1. Build 070417.