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Merging 2 TIFF files

I am merging to large TIFF files and using copyframe method. This is taking a long long time to do. is there a better method?

This is the code I am using… can this be optimized?

Dim frame As TiffFrame

            Using image As TiffImage = CType(Aspose.Imaging.Image.Load(txtEmailDocument.Text), TiffImage)
                    For i = 0 To lstattachments.Items.Count - 1
                        If lstattachments.GetSelected(i) = True Then

                            Using image1 As TiffImage = CType(Aspose.Imaging.Image.Load(Program.imagepath + lstattachments.Items(i) + ".TIFF"), TiffImage)

                                For Each tiffFrame As TiffFrame In image1.Frames
                                    image1.ActiveFrame = tiffFrame

                                    frame = tiffFrame.CopyFrame(image1.ActiveFrame)

                                    ' Add copied frame to destination image

                                    ' save the image with changes.
                            End Using

                        End If


Can you please also share your source TIFF files to reproduce the issue?

Best Regards,