c# - telerik mvc sitemap performance -

i'm using telerik's mvc extensions bind sitemap demonstrated on demos page: http://demos.telerik.com/aspnet-mvc/panelbar/sitemapbinding

but when rendering sitemap following code takes 6 seconds

<%@ control language="c#" inherits="system.web.mvc.viewusercontrol" %> <%     html.telerik().panelbar()        .name("sitemappanelbar")        .bindto("sitemap")        .render(); %> 

(the same problem exists treeview instead of panelbar)

the action method executes fast

public partial class navigationcontroller : controller {     public const string sitemapfile = "~/web.sitemap";     public const string sitemapname = "sitemap";     public const string sitemapkey = "sitemap";      [populatesitemap(sitemapname = sitemapname, viewdatakey = sitemapkey)]     public virtual actionresult sitemap()     {         if (!sitemapmanager.sitemaps.containskey(sitemapkey))         {             sitemapmanager.sitemaps.register<xmlsitemap>(sitemapkey, sitmap => sitmap.loadfrom(sitemapfile));         }          return view();     } } 

has encountered same problem and/or knows problem , how solve it?

thanks

here quote of answer in posted forum thread:

after further investigation looks out spring.web.mvc.dll issue. in case panelbar ui component check each node , children if accessible. "security trimming" feature works in case. isaccessible() method controllers , action attributes in order check item accessibility. guessed combination of application in debug mode , reference spring.web.mvc.dll cause performance issue, because retrieved attributes not cached. if need better performance suggest test in release mode. nevertheless further investigate issue , try find better solution problem. cache controllers attributes.