load_workbook works very slow
*Created originally on Bitbucket by [Maya](https://bitbucket.org/%7B942c8d7e-e4a7-4282-89ca-4b5c80816002%7D/)*
I have a excel file \(not very large, 600kb, but inside there is a lot of formated and merged cells\).
I used to use openpyxl in version 2.5.12 and everything worked fine, load\_workbook lasted 1s or less. But recently I updated openpyxl to 3.0.0 version and now it takes about 10 minutes to load the same workbook.
What can I do except back to 2.5.12 version?
*Attachments:* [CAIQ_v3.1_Final.xlsx](/uploads/15dda753febd8462eac1d24f58a66104/CAIQ_v3.1_Final.xlsx)
issue