Asp.net mvc 4 ASP.net MVC 4站点在第一次请求数据库时速度变慢

我有一个ASP.net MVC 4站点，它在第一次请求时就会变慢。我在运行应用程序时尝试了断点。在登录过程中，它几乎会在我的第一次数据库查询时停留一分钟：

  var InstnCode = form["code"].ToString();
  var ComAccount = Context.Companies.Where(x => x.CompanyCode == InstnCode); 

之后一切都很顺利

为什么会这样？我怎样才能纠正这个过程。由于这个问题，有时会出现

服务器超时错误

  [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
       public ActionResult Login(UserProfile model, string returnUrl, FormCollection form)
       {

        var InstnCode = form["code"].ToString();
        var ComAccount = Context.Companies.Where(x => x.CompanyCode == InstnCode);

        if (ComAccount.Any())
        {
            var modelvalue =
                (from d in Context.UserProfiles
                    where d.UserName == model.UserName && d.Password == model.Password && d.Company.CompanyCode == InstnCode
                    select d).FirstOrDefault();


            if (modelvalue != null)
            {
                string code = null;

                Session["UName"] = modelvalue.UserName;
                Session["Theme"] = modelvalue.Theme;
                Session["InstnName"] = modelvalue.Company.CompanyName;
                Session["Role"] = modelvalue.Role.RoleName;
                Session["StartUp"] = modelvalue.StartUp;

                var permission =
                    Context.AccountPermissions.Where(x => x.RoleId == modelvalue.RoleId)
                        .AsQueryable()
                        .FirstOrDefault();

                if (permission != null)
                {
                    SetSessions(permission, "yes");
                }
                else
                {
                    SetSessions(permission, "no");
                }

                if (modelvalue.CompanyId != 0 && modelvalue.StaffId == null && modelvalue.StudentProfileId == null)
                {
                    Session["ComID"] = modelvalue.CompanyId;
                    code = modelvalue.Company.CompanyCode;

                }
                else if (modelvalue.CompanyId != 0 && modelvalue.StudentProfileId != null)
                {
                    var student =
                        (from d in Context.StudentProfiles
                            where d.StudentProfileId == modelvalue.StudentProfileId
                            select d).FirstOrDefault();
                    code = student.Company.CompanyCode;
                    Session["ComID"] = student.CompanyId;
                }
                else if (modelvalue.CompanyId != 0 && modelvalue.StaffId != null)
                {
                    var staff =
                        (from d in Context.Staff where d.StaffId == modelvalue.StaffId select d).FirstOrDefault();
                    code = staff.Company.CompanyCode;
                    Session["ComID"] = staff.CompanyId;
                    Session["StaffID"] = staff.StaffId;
                }


                    return RedirectToLocal(returnUrl);



            }
            else
            {
                ModelState.AddModelError("", "The user name or password provided is incorrect");
                return View(model);
            }

        }
        ModelState.AddModelError("", "The institution code provided is incorrect");
        return View(model);
    }

这是我的登录功能。我正在使用

@使用（Html.BeginForm（“Login”，“Account”，FormMethod.Post，new{enctype=“multipart/formdata”}））

作为我的登录表单

任何帮助都将不胜感激。

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提前感谢

可能不仅仅是数据库：