Thanks for your posting and using Aspose.Cells.
We were able to observe this issue. Running your sample code on the latest version shows the performance and file size grow issue. I have attached the output excel files generated with the older and newer versions for a reference.
We have logged this issue in our database for investigation. We will look into it and fix this issue. Once the issue is resolved or we have some other update for you, we will let you know asap.
This issue has been logged as
- CELLSJAVA-41422 - Cells.copyRows with conditional formatting in cells causes file size grow and performance issue
Thanks for using Aspose.Cells.
We have fixed this issue.
Please download and try the latest fix: Aspose.Cells
for Java v184.108.40.206 and let us know your feedback.