why my web site give 88% of CPU

See more:

C#

ASP.NET

MVC

HTML5

my web site name is "nezamerafsanjan" and i writ it with asp.net mvc 4
look at this picutre:88%CPU

my code in Home Page :

public ActionResult Index()
       {

           HttpCookie username = Request.Cookies["nezamcookie"];
           if (username != null && User.Identity.IsAuthenticated == false)
           {
               string us = username.Values["UserName"].ToString();
               string ps = username.Values["Password"].ToString();
               WebSecurity.Login(us, ps, persistCookie: true);
               //ControllerContext.HttpContext.Response.Redirect(Request.UrlReferrer.ToString());
           }
           // CreateDate =DateTime.Parse( (persian.GetYear(r.CreateDate) + "/" + persian.GetMonth(r.CreateDate) + "/" + persian.GetDayOfMonth(r.CreateDate))),
           //         UpdateDate =DateTime.Parse ((persian.GetYear(r.UpdateDate) + "/" + persian.GetMonth(r.UpdateDate) + "/" + persian.GetDayOfMonth(r.UpdateDate)))
           var Query = _db.News.Take(30);
           var model = (from r in Query.AsEnumerable()
                        orderby r.CreateDate descending
                        select new NewsHomeViewModel
                        {

                            Id = r.Id,
                            ImageUrl = r.ImageUrl,
                            Summary = r.Summary,
                            Title = r.Title,
                            UpdateDate = ((persian.GetYear(r.UpdateDate) + "/" + persian.GetMonth(r.UpdateDate) + "/" + persian.GetDayOfMonth(r.UpdateDate)))
                        }).Take(6);
           var modelSpecial = (from r in Query.AsEnumerable()
                               orderby r.CreateDate descending
                               where r.Special == true
                               select new NewsHomeViewModel
                               {

                                   Id = r.Id,
                                   ImageUrl = r.ImageUrl,
                                   Summary = r.Summary,
                                   Title = r.Title,
                                   UpdateDate = ((persian.GetYear(r.UpdateDate) + "/" + persian.GetMonth(r.UpdateDate) + "/" + persian.GetDayOfMonth(r.UpdateDate)))
                               }).Take(12);
           var modelEducation = (from r in Query.AsEnumerable()
                                 orderby r.CreateDate descending
                                 where r.Education == true
                                 select new NewsHomeViewModel
                               {

                                   Id = r.Id,
                                   ImageUrl = r.ImageUrl,
                                   Summary = r.Summary,
                                   Title = r.Title,
                                   UpdateDate = ((persian.GetYear(r.UpdateDate) + "/" + persian.GetMonth(r.UpdateDate) + "/" + persian.GetDayOfMonth(r.UpdateDate)))
                               }).Take(6);
           ViewBag.model = model;
           ViewBag.NewsViewModelSpecial = modelSpecial;
           ViewBag.modelEducation = modelEducation;
           return View();
       }

my code is news page:

[OutputCache(Duration=360,VaryByHeader="X-Requested-With",Location= OutputCacheLocation.Server)]
        public ActionResult Index(int page = 1)
        {
            
            var model = (from r in db.News.AsEnumerable()
                         orderby r.CreateDate descending
                         select new NewsViewModel
                         {
                             Body = r.Body,
                             Comments = r.Comments,
                             Education = r.Education,
                             Financial = r.Financial,
                             Id = r.Id,
                             ImageUrl = r.ImageUrl,
                             Notic = r.Notic,
                             Public = r.Public,
                             Refahi = r.Refahi,
                             Special = r.Special,
                             Summary = r.Summary,
                             Title = r.Title,
                             Visitors = r.Visitors,
                             CreateDate = ((persian.GetYear(r.CreateDate) + "/" + persian.GetMonth(r.CreateDate) + "/" + persian.GetDayOfMonth(r.CreateDate))),
                             UpdateDate = ((persian.GetYear(r.UpdateDate) + "/" + persian.GetMonth(r.UpdateDate) + "/" + persian.GetDayOfMonth(r.UpdateDate)))
                         }).ToPagedList(page,6);
            ViewData["News"] = model;
            if (Request.IsAjaxRequest())
            {
                return PartialView("_PartialNews", ViewData["News"]);
            }
            
            return View();
        }

i dont know why this application give a lot of CPU and Memory when i upload it on my Host?