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Level 1

9 points

Safari 10 High CPU Usage

Safari 10.0 (12602.1.50.0.10) on macOS Sierra (16A323) ramps up to 200% CPU usage per Activity Monitor in a few seconds. Both the Safari and the web content processes show at this high level. Opening a second tab (even a blank one) will use another 200% until the CPU is full, after which the per-tab web content process CPU share drops to fit them all in and the CPU stays maxed out. The specific web page does not seem to matter at all.

The computer is a mid-2012 Retina MBP, 2.3 GHz i7 with 8 GB ram.

Please tell me that I'm not the only one seeing this, thanks!

MacBook Pro with Retina display, macOS Sierra (10.12), 2.3 GHz i7, 8 GB ram

Posted on Sep 21, 2016 5:54 PM

24 replies

nycradik Author

Level 1

9 points

Sep 23, 2016 10:48 PM in response to gtmuniversal

That was perfect, thanks!

usr555

Level 1

8 points

Sep 26, 2016 5:12 AM in response to nycradik

You are not the only one. I have your same machine, and it's worst with Safari, but the CPU heat is also elevated when I use Firefox. I haven't tried Chrome.

Eric Root

Level 10

684,039 points

Sep 26, 2016 5:56 AM in response to usr555

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. A new post would be much more visible. You can link to this one.

Try running this program in your normal account and post it in a new reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

jtowriss

Level 1

8 points

Sep 29, 2016 11:21 PM in response to gtmuniversal

I did this and it immediately solved the cpu usage problem I was having with Safari. Thank you.

HPDoor

Level 1

4 points

Oct 5, 2016 12:31 AM in response to gtmuniversal

That did the trick ! Thanks.

Oct 8, 2016 12:46 AM in response to nycradik

I had ther same issue.

After upgrading to MacOS Sierra on my iMac 4k 21ich, when i started safari, the CPU maxed out!!

I uninstalled the ad blocker extension.

I was told my support to start in safe mode (restart Mac by holding the SHIFT key).

I started safari , it seemed ok, so i restarted normally and after watching safari max the CPU out, within a minute it resolved itself.

max

iraymac

Level 1

4 points

Oct 16, 2016 8:28 AM in response to gtmuniversal

Brilliant - solved!

Nov 23, 2016 5:55 AM in response to gtmuniversal

Thanks so much!

Immediate redress.

Normal CPU usage after uninstalling rapport and restart of safari.

Eam431

Level 1

4 points

Dec 11, 2016 10:49 AM in response to nycradik

Hi there

I had the same problem on my MacBook air, after sierra update. Went in to Finder, applications, Utilities, disc utility and ran first aid. It found boot disc corrupted requested run first aid in recovery mode, so shut down MacBook started again holding down cmd and r, to enter recovery mode, ran first aid again through utilities, repaired corruption. Restarted again all tickets boo no Safari overusing the CPU no overheating. All Good

Safari 10 High CPU Usage