Xlsx file is taking too long to open manually After NPOI excel write operation

[ayosuva]

NPOI version : 2.5.6
I am reading and writing the test data into existing excel file and existing sheet using NPOI C# library. It was working fine till early last week but suddenly we noticed xlsx files is taking too long to open manually(it is taking 10 to 20mins). I have tried investigating it and the problem occurs only when there is write operation and it works fine if there is only read operation. Any input on this will be helpful .

Also It reduces the file size from 959kb to 216kb.

[Bykiev]

you can unzip excel file and compare the changes

[tonyqus]

Please open a issue in Issues and upload the Excel file.