macrumors G3
Nov 23, 2011
Open Activity Monitor and check the usage when you try to do that.

I've seen 2015 15" MBPs slow to a crawl when simply trying to scroll through a large Word document with loads of content -- CPU usage goes to nearly 400%. Also occurs on 2012 cMBP. Issue happens regardless of forcing dGPU or iGPU, so I think Office is set for CPU to render or process everything. Also happens on 2011 & 2016.

TL;DR: Microsoft's programming for Office is really shoddy, so although the problem I've described is different to yours, I wouldn't be surprised if you noticed equally high resource usage when trying to rename an Excel tab.


macrumors member
Nov 10, 2015
I really think MS Office Suite for Mac is the worst app I have ever seen. Especially Outlook (current version) is heavily lagging, when it comes to calendar events and reminders I see beach balls all the time... not to mention, that Outlook is completely crashing regularly (no other of my Mac apps does that).


macrumors 6502
Dec 30, 2015
Sweden, Gävle
Well, office for mac drain battery and are not performance effective according to me.

I only use excel and word because my school use it so I want my teachers to see the documents like I do.
If it wasn't for that I should use Pages, keynotes and numbers.

Aldo numbers are not as good as excel regarding the functions.


macrumors 68040
Mar 21, 2014
OP, what you've described in the subject is not normal in my experience, however, CPU usage does spike when work is performed in the Page Layout View mode, much less so when working in Normal View mode. If you're using the former View mode, I suggest a switch to Normal View.

I'd read bug reports about this issue as early as last summer. I work in the Windows version of Excel, it too will occasionally peg a GPU or CPU in Page Layout View - I generally only work in Normal View.
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