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Oct 5, 2016 2:12 PM in response to Volutinby jameson.h,Hi Volutin,
I understand that after your upgrade to Sierra, your Mac Pro is becoming slow and hangs while opening apps. You've noticed this happening most frequently with Excel 2011 and Preview. I can certainly understand the concern here, and I'm happy to assist.
As a first step, please follow all the instructions listed here:
macOS Sierra: If your Mac runs slowly
If the issue persists after taking the above steps, I recommend that you try starting up your Mac using safe mode. Take a look at the following information:
Try starting your Mac in Safe Mode. Restart your computer. Hold the Shift key when you hear the startup sound. Release the Shift key when you see the Apple logo appear. This starts your Mac in Safe Mode. Safe mode performs a directory check of your startup disk, and removes some cache data. After your Mac finishes starting up, restart your Mac normally (without holding the Shift key) and see if the issue is resolved.
If the issue persists in safe mode, I also recommend testing for this issue in a new "test" user account. Follow the steps in the section titled "How to test with another user account":
How to test an issue in another user account on your Mac - Apple Support
Cheers! -
Oct 6, 2016 9:46 PM in response to jameson.hby Volutin,Thanks for your reply.
None of the issues listed at the link you provided (macOS Sierra: If your Mac runs slowly) appear to be relevant. My Mac Pro has over 200GB of free disk space and 64GB of RAM and the activity monitor was not showing any unusual activity when the slow-down / hang issues occurred. I am not running any apps that require specific processors or graphics cards.
I have started up my Mac Pro in safe mode and the problem disappeared. I then restarted in normal mode and the problem did not initially recur. After a day of problem-free use of my Mac, the problem recurred immediately upon launching the Messages app from the dock. When I attempted to launch the Messages app, my Mac hung for about 25 seconds, then the app launched, but the part of the window where the messages should appear was blacked out. I tried to open a file in Excel 2011 and the Mac 'beachballed' while showing a blank open file dialogue window (as had been occurring previously).
My trackpad was still responsive and I was able to force quit Excel (it was not showing as non-responsive in the Force Quit menu, but I was still seeing a blank open file window and beachball). I then restarted my Mac in safe mode again. Once booted up in safe mode, I opened the Messages app, which still showed a black area where messages should appear. I opened Excel and was able to launch a file via the open file menu as normal.
I restarted my Mac in normal mode and all problems had again disappeared - Messages and Excel both worked normally.
I'd be grateful for any further thoughts on what might be happening, or advice on possible fixes. (I haven't yet tried setting up a 'test' user account, but will do this when the problem recurs.)
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Oct 7, 2016 8:14 AM in response to Volutinby joe_7399,Hi Volutin, thanks for your followup. If you notice that the issue persists in a new test user account, we recommend that you reinstall macOS using macOS Recovery as a next step. Take a look at the following steps for an overview of this process:
Start up from macOS Recovery by holding down Command (⌘)-R immediately after turning on or restarting your Mac. Release the keys when you see the Apple logo. Startup is complete when you see the utilities window.
Choose Reinstall macOS (or Reinstall OS X) from the utilities window, then follow the onscreen instructions.
This installs the latest version of macOS that was previously installed on your Mac.How to reinstall macOS - Apple Support
Also, it might be a good idea to use Apple Diagnostics to check your Mac Pro's hardware. Take a look at this website for more information:
Using Apple Diagnostics - Apple Support
Take care! -
Oct 7, 2016 9:12 AM in response to joe_7399by already_here,Lots of users who have such type of slowdown problems happen to use Microsoft Office, i think Microsoft haven't updated their app suite to be Sierra compatible, and since MS Office installs and runs services and other stuff in the background even if main app isn't active, they might cause these slowdowns.
Visit MS Office support forums and look up possible compatibility problems.
