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Sub LoopFillRange()
'   Fill a range by looping through cells
    Dim CellsDown As Long, CellsAcross As Long
    Dim CurrRow As Long, CurrCol As Long
    Dim StartTime As Double
    Dim CurrVal As Long

'   Change these values
    CellsDown = 500
    CellsAcross = 200
   
    Cells.Clear
'   Record starting time
    StartTime = Timer

'   Loop through cells and insert values
    CurrVal = 1
    Application.ScreenUpdating = False
    For CurrRow = 1 To CellsDown
        For CurrCol = 1 To CellsAcross
            Range("A1").Offset(CurrRow - 1, CurrCol - 1).Value = CurrVal
            CurrVal = CurrVal + 1
        Next CurrCol
    Next CurrRow

'   Display elapsed time
    Application.ScreenUpdating = True
    MsgBox Format(Timer - StartTime, "00.00") & " seconds"
End Sub