Thanks for your posting and using Aspose.Cells.
Please download and try the latest version: Aspose.Cells for .NET 8.3.1 it should fix your out of memory issue.
Please note, we do not fix bugs in older version. We only fix bugs which are found in latest version.
So, if you still encounter out of memory issue with the latest version, you can provide us your Excel file and sample code replicating this issue with the latest version for our investigation. We will look into it and help you asap.