Office 365 excel, word and outlook Cpu usage very high

We recently upgraded our office application to 365.
After install it I found that all computers cpu usage is very high, used by excel or word or outlook 25% for each app
Please help
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Alex GreenProject Systems EngineerCommented:
What sort of hardware are you running it on?

What did you have previously?

If you're running something like office 2003 or 2007 or even 2010, they use significantly less resources, if you're installing this on a laptop that's say, 5 years old, it's going to impact it.
Edmond HawilaChief Operating OfficerCommented:
Also how is your Internet Connection?
Could be that Outlook is downloading emails for everyone if in Cache mode.
Leave it a couple of days and this should iron out if this is the case.
Alex GreenProject Systems EngineerCommented:
That wouldn't explain the high CPU usage to be honest, It'll batter his network but the CPU is a different issue.

Also that wouldn't explain the high CPU in Excel
Kathy JacobsSocial media geekCommented:
Is sync to OneDrive running? It could be that the OneDrive software is trying to save all the content and changes from docs to OneDrive in real time. One way to test this is to save to a local drive while working on the docs, then copy to OneDrive when done.
Edmond HawilaChief Operating OfficerCommented:
Hi Alex, we've actually seen the CPU go quite high when Outlook first syncs with O365, especially with older hardware as you suggested.
It did iron out after a day or two as all the users got synced.

Another thing is to ensure you get SSD drives at least. Windows 10 seems to be a pain without that, even with superfetch turned off.
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