UPDATED!! It's been a month since I experienced the same problem, which started when I updated my MacOS to Ventura. After reading various articles, I came across a reply from Makapu on this Microsoft Office community forum: link.
I was using Office Suite versions 16.78 and 16.79, and not only MS Word but also my PowerPoint (PPT) was VERY laggy. After going through all the articles, I found that this problem appeared after updating to version 16.59.
The solution: Try downgrading your Office suite, or only MS Word, to version 16.49. But before that, you need to delete all remaining files in the Containers folders. This worked well for me.
The following method is to revert to Word only version 16.49.
1. To prevent the rolled back updates from being automatically updated, choose Help at the top of the screen > Check for Updates > Turn off "Automatically keep Microsoft apps up to date"
2. Close all Office apps.
3. Open [ Finder ], [ Applications ] and Put the " Microsoft Word" app to the Trash.
4. Open [Library] by selecting [Go] from the menu ~/Library/Containers , and move the following files in [ Containers ] to the Trash.
Microsoft Word(for macOS 10.15 or later)
com.microsoft.Word( before macOS 10.15 )
5. Move the following files in [Library]-[ Group Containers ] to the Trash. ~/Library/Group Containers
UBF8T346G9.ms
UBF8T346G9. Office
UBF8T346G9. OfficeOsfWebHost
6. From the Dock, put the Word app to the Trash.
7. Download and install < Word 16.49> and other office app like excel, ppt, from the update history of Office for mac .
8. Start Word and see if the problem goes away.
* If you check the following pages, it will be easier to grasp the image.
· Office For uninstall the Mac (microsoft.com)
Hope this helps everyoneee <3
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