I have checked with the latest version 126.96.36.199. But the performance has not improved. I have 22 columns ans 3 columns are having more than 1000 characters each. I have 22690 rows and the total excel size is 29 MB. Its taking around 5 minutes 20 seconds for applying autofitrows().
Thanks for your feedback.
Since, your output xls/xlsx file is quite large, so we think, it is normal that Aspose.Cells is taking so much time.
If you get performance issue because of smaller file, then it might not be normal and we might investigate your issue.