Hi, Opening the attached file using Aspose Cells takes over 600 seconds. It takes 30 seconds to open the file in Microsoft Excel. We are using version 2.1.1. Can you please have a look and see if you can optimize this. …...uleks July 1, 2017, 10:31pm #7 Great. Thanks, Ulf aspose.notifier...still find the issue, please zip the Excel file and attach it...