Get List consume time

Question

I have get data from two table using join in linq c# and show a data list in front end .But its very consume time

I want to not time consume

 

it's me code

var Result = (from UM in _context.UserP
join C in _context.ContactUs on UM.UserId equals C.UserId
where UM.UserId == C.UserId
select new
{
UM.UserImage,
C.Name,
C.UpdatedDate,
C.Email,
C.Message,
C.ContactUsId
}).ToList();
if (Result.Count > 0)
{
foreach (var item in Result.OrderByDescending(t => t.Name).ToList())
{
ReportManagementViewModel obj = new ReportManagementViewModel();
obj.UserName = item.Name;
obj.Email = item.Email;
DateTime aDate = Convert.ToDateTime(item.UpdatedDate);
obj.Date = aDate.ToString("MMMM dd, yyyy");
obj.Message = item.Message;
obj.UserImage = item.UserImage;
obj.ContactUsId = item.ContactUsId;
List.Add(obj);