SQL Server SELECT LAST N Rows

This is a known question but the best solution I've found is something like:

SELECT TOP N *
FROM MyTable
ORDER BY Id DESC

I've a table with lots of rows. It is not a posibility to use that query because it takes lot of time. So how can I do to select last N rows without using ORDER BY?

EDIT

Sorry duplicated question of this one

You can get SQL server to select the last N rows with the following query:

select * from tbl_name order by id desc limit N;

I tested JonVD's code, but found it was very slow, 6s.

This code took 0s.

SELECT TOP(5) ORDERID, CUSTOMERID, OrderDate    
FROM Orders where EmployeeID=5    
Order By OrderDate DESC