Is the Linq Count() faster or slower than List.Count or Array.Length?

Question

Is the LINQ Count() method any faster or slower than List<>.Count or Array.Length?

Answer 1

I would say it depends on the List. If it is an IQueryable that is a table in a db somewhere then Count() will be much faster because it doesn't have to load all of the objects. But if the list is in-memory i would guess that the Count property would be faster if not about the same.