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Speed up copying of rows from one workbook to another

Hi,

An expert recently provided the solution below which works perfectly except with the size of my dataset, its taking 17 minutes to execute. Is there anyway to speed it up considerably?

The code executes in a workbook (the Destination), opens another workbook (the Source) sheet1, copies all rows from the source where the date in column A of the source is greater than the latest (max) date in Column A sheet "Raw Data" of the destination (starting with the next blank row of any existing data)

Any help would be greatly appreciated!

Sub LoadData()
    Dim srcWb As Workbook
    Dim srcWs As Worksheet, destWs As Worksheet
    Dim maxDate As Date
    Dim i As Long, destCurrRow As Long
   
    Application.ScreenUpdating = False
    Set destWs = ActiveWorkbook.Sheets("Raw Data")
    Set srcWb = Workbooks.Open("C:\!Data\Book1.xlsx")
    Set srcWs = srcWb.Sheets("Sheet1")
   
    'Get Max Date
    maxDate = Application.WorksheetFunction.Max(destWs.Range("A:A"))
   
    destCurrRow = destWs.Range("A" & Rows.Count).End(xlUp).Row + 1

    For i = 2 To srcWs.Range("A" & Rows.Count).End(xlUp).Row
        If srcWs.Range("A" & i).Value > maxDate Then
            srcWs.Range("A" & i).EntireRow.Copy destWs.Range("A" & destCurrRow)
            destCurrRow = destCurrRow + 1
        End If
    Next i
   
    Application.DisplayAlerts = False  'avoids clipboard message
    srcWb.Close SaveChanges:=False
    Application.DisplayAlerts = True

    Worksheets("Table").Select
     
    Application.ScreenUpdating = True
    MsgBox "Data was successfully imported!", vbInformation
End Sub

Thanks in advance,

swjtx99
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swjtx99
Asked:
swjtx99
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1 Solution
 
Martin LissOlder than dirtCommented:
How about using a Filter to just show the rows with the desired date and then copy all the rows that are still visible (at once) to the new workbook?
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swjtx99Author Commented:
Hi Martin,

Thanks for the reply. That is how I'm doing it now (manually) and wanted to automate it. I suppose if in VBA a filter could be applied to hide/delete all rows with a date in Column A of the Source workbook older than the latest date in the Destination and then copy everything over at once, that would also work.

Thanks,

swjtx99
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Martin LissOlder than dirtCommented:
You could record a macro while you do it manually. You could also provide me cut down versions of the two workbooks and I can do it for you.
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Martin LissOlder than dirtCommented:
The following could be used as the starting point for the new macro. Right now it filters, copies and pastes from one sheet to another in the same workbook and that and the filter date would need to be changed.

Sub OneFellSwoop()

Dim rng As Range
Dim lngVisibleCount As Long

Set rng = Range("A1:A" & ActiveSheet.UsedRange.Rows.Count)
' Clear any existing filter
rng.AutoFilter

With rng
    ' Filter out everything that doesn't have 2/20/2015 as the date in coulmn 1
    .AutoFilter Field:=1, Operator:=xlFilterValues, Criteria2:=Array(1, "2/20/2015")
    ' Copy the visible rows
    .SpecialCells(xlCellTypeVisible).EntireRow.Copy
End With

' Get a count of the visible rows
lngVisibleCount = Cells(1).CurrentRegion.Columns(1).SpecialCells(xlCellTypeVisible).Count

With Sheets("sheet2")
    .Select
    ' select the number of rows as the destination for the paste
    .Range("A1:A" & lngVisibleCount).Select
    .Paste
End With

Application.CutCopyMode = False
Selection.AutoFilter
End Sub

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swjtx99Author Commented:
Hi Martin,

Thank you. I'll see if I can work it out based on your starting point. If not, I'll post cut down versions of the files.

Sincerely,

swjtx99
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Hakan YılmazTechnical Office MEP EngineerCommented:
Set calculation setting to manual in the beginning, if not needed.
Application.Calculation = xlCalculationManual

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And set back again to automatic, if needed.
Application.Calculation = xlCalculationAutomatic

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Excel tries to calculate all workbooks opened in the same application instance even when a single cell value changes.
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swjtx99Author Commented:
Hi Hakan,

Thanks. I did have that in the working version but it was of little help.

I've attached a cut version of the two workbooks. The "Destination Workbook.xls" contains the macro I'm using now. The "testdata.xls" is the workbook that contains the rows I want to copy over to the destination (only those that have a date in column A after the max date found in column A of the Destination workbook).

If you put both of these into a folder named c:\!data and run it you can observe how slow it is and again, these are smaller versions of the actual files.

Thanks,

swjtx99
Destination-Workbook.xls
testdata.xls
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Hakan YılmazTechnical Office MEP EngineerCommented:
Use this instead of copying.
destWs.Range("A" & destCurrRow).EntireRow.Value = srcWs.Range("A" & i).EntireRow.Value

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Or this, simpler.
destWs.Rows(destCurrRow).Value = srcWs.Rows(i).Value

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Or this may even be faster
destWs.Rows(destCurrRow).Value2 = srcWs.Rows(i).Value2

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And then format new rows if needed.
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Ejgil HedegaardCommented:
Or sort the source data in ascending date order, find the date > maxDate, and copy the entire range from that point down at once.
See attached.
Destination-Workbook.xls
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swjtx99Author Commented:
Thanks to all who responded for your time.

Eigel, this solution worked very well and very fast. Even on the production workbook with over 50K rows, it only took a few seconds. Exactly what I needed.

Very much appreciate your help.

Regards,

swjtx99
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Hakan YılmazTechnical Office MEP EngineerCommented:
Again in Ejgil Hedegaard's code, use this instead of copying cells.
    If i <= sourceMaxRow Then
        destWs.Range(destWs.Cells(destCurrRow, 1), destWs.Cells(destCurrRow + sourceMaxRow - i, sourceMaxColumn)).Value2 = _
        srcWs.Range(Cells(i, 1), Cells(sourceMaxRow, sourceMaxColumn)).Value2
    End If

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swjtx99Author Commented:
Hi Hakan,

Thanks for the additional info. What does this do? Does this speed up the execution?

Regards,

swjtx99
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Hakan YılmazTechnical Office MEP EngineerCommented:
Of course. This only copies values without formats. You may also modify Ejgil's code to paste values only.
But i prefer direct setting of cell values; you don't have to switch sheet or select a cell before.
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