[2005] Class - Efficiency - Which is better practise

[SammyWaslow]

Rather new to the OOP approach, I got some questions concerning efficiency.
In my class I have some private functions. Some properties return values based upon these functions.

Would it be best if I set a variable in my class and Initialize it in the constructor, then return this variable, like so:

Public Class MyMovie
    Private strMovie As String
    Private strName As String
    Private strYear As String
 
    'Constructor
    Public Sub New(ByVal strFullMovieName As String)
        strMovie = strFullMovieName
        strName = DoABunchOfStuff() 'This is a private function in my class
    End Sub
 
    Public ReadOnly Property Name() As String
        Get
            Return strName
        End Get
    End Property
 
(...)

Or by calling the function directly from the property, like so:

Public Class MyMovie
    Private strMovie As String
    Private strName As String
    Private strYear As String
 
    'Constructor
    Public Sub New(ByVal strFullMovieName As String)
        strMovie = strFullMovieName
    End Sub
 
    Public ReadOnly Property Name() As String
        Get
            Return DoABunchOfStuff()
        End Get
    End Property
 
(...)

I reckon that in the latter example each time I 'm getting the value of that property, the private function has to be executed where as in the first example this only happen when creating an instance my class. The first would be more efficient, better. Am I right or ?