Hi @Brancoveanu Viktor ,
After my test, my upload and edit file is not slow, and I don't need to close all other excel files to save the excel file.
Maybe you can try the following methods to see if it improves:
- When you finish editing, you can try to save manually by using the shortcut key Ctrl+S.
- Try to use a different browser or your browser's InPrivate mode to see if the same error occurs.
The solution to the very slow upload speed:
- Reducing the number of content types
- Division of the structure into several libraries
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