HT204416: Get the latest version of Safari for your Mac
Learn about Get the latest version of Safari for your Mac
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Oct 21, 2015 2:07 PM in response to mcastillo5125by k3bert,Same problem here, tried the troubleshooting steps recommended to no avail. The CPU seems to go crazy when I launch a second tab. If I don't use any tabs, it works like a champ. The worse part about this is it eats the battery up. In a 30 minute window today, I lost 40% of my battery charge as a result of this issue.
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Oct 26, 2015 8:27 AM in response to mcastillo5125by robbsterino,I tried solutions listed in this thread and the CPU utilization always went back up to 250% or more. When Safari 9.1 came out I upgraded, then also upgraded to El Capitan 10.11.1 and have not seen the problem over the last several days.
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Nov 17, 2015 8:03 AM in response to mcastillo5125by ryan1127,I have the same issue. After much troubleshooting I narrowed down the problem. It seems to be related to the 'top sites.' If I open safari directly to a webpage (as opposed to top sites) CPU levels are fine. I can browse forever on multiple webpages without issue. As soon as I click on the search bar, open a new tab (to top sites), or go to my top sites, CPU spikes immediately and never drops down. Obviously some problem with accessing top sites. No idea about a fix, but I thought this might help target a solution.
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Dec 13, 2015 8:10 AM in response to ryan1127by schalliol,I don't use Top Sites intentionally, but it opened new windows to top sites. Even when I didn't have that open, I was getting 208% on average with Safari. What I did was open top sites, remove all of the current ones (more follow) and then change prefs to opening to blank windows. Quitting and re-launching Safari seems to have fixed it (maybe it will come back, not sure)
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Dec 23, 2015 2:24 PM in response to mcastillo5125by K4stan,I notice the same problem today: Safari take 30-40% of CPU even if there is no activity. I finally located the source of this issue (at least mine).
The problem occur whenever certian website was in the bookmarks or/and in the history (or in "most popular" bookmarks - not sure if it is same as history).
In my case it was website that was monitoring price of the Bitcoin in real time. ( Bitstamp.net - Tradeview).
The problem is, that even if you clear the bookmarks and the history, but you visit that website regularly, it will end up in your "most favorite" bookmark and hence the high CPU usage is back. I think this is why some of you reported : "it was back in 15 min."
What is strange, that i notice that yesterday. I have this bitcoin website in bookmarks for months and there was no Safari update this week , right? But maybe i just did not notice it since last Safari update (although, the laptop body get warm and after while even fan could be heard, which i would notice when idle... so i doubt it)
P.S. When i remove Bitstamp from bookmarks & history, i have to quit and start again Safari to get rid of the problem...
(OS X 10.11.2 , Safari 9.0.2)
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Jan 22, 2016 10:26 AM in response to mcastillo5125by NotSoTechnical,I've started experiencing massive CPU usage in Safari 9 with certain sites pinned to the Tab Bar. The one site in particular is ZenDesk, a web-based hosted application (no Java that I'm aware of, just JavaScript). However, I also experienced trouble with ZenDesk in Chrome, as well, so not sure if the problem was related to it being pinned in Safari. When run in Firefox, the site seems to be fine. I think it may be a memory leak in ZenDesk that only affects Safari and Chrome, but it's brought my laptop to its knees, consuming all disk space as the kernel was writing massive amounts of temporary memory to disk.