Move files is too slow

Hi experts

I am using the following routine to move files one by one.  The idea is to split a large directory (over 600MB) that is full of small .dat files into smaller directories to facilitate burning them to CD's.  It worked great during testing when I was using 6 MB chunks, however I want to finish up the app now, so I moved it to the final size of appx 600 MB and it is taking way too long!  How can I make this FASTER?  Am I up a river here?

imports system.io

    Public Shared Sub MoveFiles(ByVal Path As String, ByVal Dest As String)
        Dim aFiles() As String = Directory.GetFiles(Path)
        Dim s As String
        Try
            For Each s In aFiles
                If GetFolderSizeMB(Dest) < 597 Then 'Check how big the destination folder is getting and make a desicision based on that
                    File.Move(s, s.Replace(Path, Dest)) 'replace pathnames
                Else
                    My.Computer.FileSystem.WriteAllText(Dest & "\marker.txt", "marker", True) 'Create a file in each directory.  A timer running in this particular application checks for this file so as to know when to change to the next step.
                End If
            Next s
        Catch
        End Try
    End Sub
xfungalxAsked:
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xfungalxAuthor Commented:
Simply writing the question here allows me to see the HUGE bottleneck here.  Getting the folder size on every pass of the loop is what is KILLING me here.  I will recode this and see if I can find a better way to track the size...
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xfungalxAuthor Commented:
Got it, put the folder size checker on a seperate timer and out of the loop.  Problem resolved.

Thanks anyway!
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Naveen SwamyYash Infinite Solutions Private LimitedCommented:
and don't forget to use System.Windows.Forms.Application.DoEvents()
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gregoryyoungCommented:
here's an easier thought ..

instead of checking how big it has gotten by iterating all the folders every time ... just remember (and add together) the sizes of all of the files you are copying over ... this should make it so you only need to caluclate the existing size once (then just add the amount you have copied to the original size). This would also allow it to be deterministic where as the timer is not deterministic (you could get into a funny situation where the timer doesn't get a chance to run but the data is too big (if someone were quick)

Cheers,

Greg
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