7 Replies Latest reply: Jan 16, 2013 8:17 PM by namerg
radman Level 1 Level 1

So Last night I upgraded 4 of my macs to Mountain Lion

including my MBP retina 2.7/16gb.  The install was smooth but I have noticed a major slow

down in the speed which Safari loads pages? I compared to firefox and chrome and there

seemed to be roughly 3x slower performance of Safari on all my machines.

I have all exstensions turned off? Has anyone else had this issue?

Mac Pro, Mac OS X (10.7.3)
Reply by officespace2 on Jul 26, 2012 7:39 AM Helpful

I, too, am having this problem. I am writing this from Firefox because Safari is unusable.

All replies

  • officespace2 Level 1 Level 1

    I, too, am having this problem. I am writing this from Firefox because Safari is unusable.

  • radman Level 1 Level 1

    Yes really notice after browsing on other browsers?

    I am in the process of moving all my bookmarks to chrome

    This is the first time I have considered abandoning safari

  • AppleBhoy Level 1 Level 1

    can you log into secure websites? i.e ebay, amazon??? since upgrading i cannot log into secure sites, on 3 upgraded macs

  • Ryan915 Level 1 Level 1

    same here. finding that new safari is at least 1.5x slower than it was before i upgraded to mountain lion.

  • Richard Cartledge Level 2 Level 2

    Did you install Safari 6.0 straight after ML?

    I have not noticed any slowness and have been using the developer preview and release version for months.

    First I would create a new user account is

    Apple Menu>System Prefs>Users and Groups.


    Logout and login with the new user and test.

  • Joseph Delaney Level 3 Level 3

    Try the suggestions on this support page:



    This helped for me, a lot. Safari is much faster and has stopped crashing (knock on wood - it's only been a couple of hours)


    The only problem with that advice is that it doesn't tell you which "add ons" you need to keep.


    This is what I left in my "Internet Plug-ins" folder, I'm reasonably sure that these are the ones that come with Mountain Lion:



    Quartz Composer.webplugin

    QuickTime Plugin.plugin


    After you delete any others, start up safari again and see if you notice an improvement. If you do, try re-installing Flash, if you want it (you'll have deleted it by following these instructions) - make sure you get the newest version from http://get.adobe.com/flashplayer/ - and then test Safari again. Do the same for any other plugins that you may need like Flip4Mac and Silverlight (you need Silverlight if you use Netflix streaming).


    Message was edited by: Joseph Delaney

  • namerg Level 1 Level 1

    I did remove from /Library/Internet Plug-Ins/

    SharePointBrowserPlugin.plugin/ and Quartz Composer.webplugin" It is way faster my browsing on Safari