Sep 27, 2017  I had several entries related to Office and OneDrive/Office 365. I deleted all of them. I opened Word again, signed into Office 365/OneDrive. I then opened each of the other Office 2016 apps (Excel, PowerPoint, OneNote; I do not use Outlook but open it, too, if you do) one at a time.

Pdf reader for mac. When I had a similar problem, disabling dropbox integration (I never realized I had enabled it) made a huge difference in performance, especially for otherwise trivial things in Office/Excel like copy and paste (which had become unbearable). System Preferences->Security & Privacy->Privacy Tab->'Allow the apps below to control your computer' (dropbox was checked, I unchecked it). Not sure exactly what functionality this took away from dropbox, but it still syncs folders fine, which is all I used it for anyway. (I know this is thread is over a year old, but it's one of the first results in Google so I'm adding this for all the others who come along in hopes it may help them).

I believe there is an out of control process causing this that needs to be force quit to get performance back to normal. Here are my online findings on the topic: • • • The comments hint towards too many 'open ports'. Force quitting the excel process via activity monitor with the most ports seems to do the job. I suspect this is a registration connection issue.

Office tries to constantly connect home and check that the product is registered. If you are offline and then go online then the issue occurs.

I'm guessing these open ports are in reference to internet connections to a registration server. I have Office 365 Excel 16.10 running on High Sierra (10.13.3).

Copying takes several seconds, sometimes cell comments are not viewable at all & often my previously working Hyperlinks to other files in the same folder don't work. Neither unfreezing pans/rows, adding Excel to System Preferences > Security & Privacy > Privacy Tab > Accessibility nor using Normal View (my standard anyway) made any improvement in its performance. I didn't have Dropbox in my Privacy list. Disconnecting from the internet improved the situation, however. Copying is a little quicker, although viewing comments and using Hyperlinks are still unreliable.

I have to say that I don't consider this a practical solution, merely a workaround while waiting for Microsoft to fix the problem.