A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi David,
Thanks for your clarification.
So, the issue is for some large worksheets, when edit them in Excel desktop application, it will take near 5 minutes to response your editing operation.
You may try the following options:
Option 1.Download the file and then re-upload a copy of it to the library. Check if the re-uploaded file have the same issue.
Option 2.Check with other users in your tenant. Do they run into the same issue when editing the same file in Excel. Check if the issue is only related to your account.
Option 3. Upload the copy file to another library. Check if the issue is related to specific SharePoint Online library.
Meanwhile, could you share with us some sample files in the library? I have sent you a private messageto collect them. We want to test with the same file from our side.
Moreover, please open Excel>click File>Account>capture a screenshot of all info under Product Information.
Regards,
Tim