Should I Upgrade to High Sierra?

Discussion in 'iMac' started by conteaparis, May 22, 2018.

  1. conteaparis macrumors newbie

    Oct 18, 2017
    Hi, I purchased an iMac 27 5K back in November with a 500GB SSD, and I was wondering if I should “upgrade” to High Sierra? Are there any known issues that come about from doing that (slowdown, software compatability, glitches, etc)? Currently, the computer runs fine on Sierra, but I was wondering if I am compromising safety or anything like that by choosing not to upgrade? Any game changing features I should be aware of? Other than the new files system which I am interested in, but don't quite understand fully I mean. Thanks in advance for any help!
  2. bbnck, May 23, 2018
    Last edited: May 23, 2018

    bbnck macrumors 6502a

    Mar 19, 2009
    Apple tend to continue supporting older versions of macOS for about three years (usually when it's close to being three versions behind), but this isn't guaranteed because Apple do not have a minimum support period for macOS releases unlike Microsoft with Windows. With Apple software, it's an unfortunate guessing game.

    To give you some context, OS X El Capitan (this is the release prior to macOS Sierra) was last given an operating system security update in March 2018 but Safari for OS X El Capitan last received a security update last month in April 2018. As we're approaching the middle part of 2018, we may not see another security update for OS X El Capitan (again, we are nearing the presumed three year support window). That said, macOS Sierra is only one release behind the current and so it should continue to receive security updates until next year. This isn't guaranteed.

    The only thing you can go by to see whether or not Apple may have discontinued support for an older release is to see what operating system versions Apple appear to be supporting when they are issuing security updates. You can see this information here: However, it's important to remember that not all security updates will affect every recent version of macOS, which makes it even more difficult to know whether Apple have quietly dropped support for an older release.

    All I can say with certainty at this point is that they have certainly dropped support for OS X Yosemite (released in October 2014), and that's because we haven't seen any security updates for OS X Yosemite since September 2017.

    That said, macOS High Sierra has been out for a while now and most people find it far more stable and bug-free than Sierra, and you will find it performs faster on your Mac with Retina display because the Window Server now runs on top of Metal 2 (e.g. Mission Control animations are finally super smooth). If you decide to upgrade, make sure you backup your Mac first with Time Machine in case you need to downgrade. With every major operating system release, some people prefer to put the macOS image onto a USB flash drive and perform a clean install, which is also why some folks will wait a year or two before upgrading from one release to another. You shouldn't necessarily need to perform a clean install but upgrading in-place can, in rarer cases, cause issues that are not present when installed from scratch.
  3. nambuccaheadsau macrumors 68000


    Oct 19, 2007
    Nambucca Heads Australia
    Do a backup and as suggested download HS and do a format and clean install.
  4. JustMartin macrumors 6502a

    Feb 28, 2012
    Yes, by all means do the upgrade. APFS may make some operations faster, but otherwise I wouldn't expect much difference. Backup first, but I'm not sure why you need to do anything like a format and reinstall, the regular upgrade process has worked fine for me
  5. Guy Clark Suspended

    Guy Clark

    Nov 28, 2013
    London United Kingdom.
    Remember APFS does not currently support Fusion Drives.
  6. JustMartin macrumors 6502a

    Feb 28, 2012
    Yeah, should have been clearer. I know APFS is not available for Fusion, what I was trying to say was that I wasn't sure its absence would make much difference

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