OS X 11.7.11 runs far too slow on my mid 2014 iMac

Question

OS X 11.7.11 runs far too slow on my mid 2014 iMac

I have a 21.5 inch mid 2014 iMac (1.4 Ghz Dual Core Intel i5) which has updated to OS X Big Sur 11.7.11 but sadly it runs interminably slow, with us constantly having to suffer the dreaded spinning wheel, when merely using Safari and Mail apps.

We only need the computer for browsing the net, email and occasional word processing, so I really don't want and actually can't afford to purchase an updated replacement.

As a result, I was wondering if it might be worth me reformatting the hard drive and installing an older version of OS X (perhaps a version of OS X without quite so many whistles & knobs)?

If so, my question is what would be the optimum version of OS X which might run at an acceptable speed (ideally at a similar speed to when the computer was first purchased in 2015), but without discovering that everything else eg. the majority of web sites and apps won't run without a system update?

With my utmost thanks in advance to anyone who takes the time and the trouble to assist with this infuriating issue, as it seems downright ridiculous for us to be forced to write off such a delectable piece of computer kit so as to be able to remain connected to the outside world at an acceptable speed and to end up having no choice but to find some means of replacing it with a more modern alternative, with an array of additional features that we neither want or need!

All assistance most gratefully received and my apologies for my customary lack of succinctness

Bernard

Posted on Oct 25, 2026 7:58 PM

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Answer 1

MrHoffman

Level 10

168,001 points

Oct 26, 2026 7:19 AM in response to thedogsbollock

Do have complete and current backups. Always. But particularly now. Have a backup. Now.

If this is the hard disk configuration, and particularly the 8 GB hard disk configuration, here is:

Why is my hard disk drive iMac so slow? - Apple Community

Here is one means of speeding the storage, short of a newer Mac:

Use an external SSD as your startup disk … - Apple Community

To see if the hard disk drive or fusion drive hard disk component is possibly failing, post a DriveDx report.

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Answer 2

Oct 26, 2026 9:15 AM in response to thedogsbollock

Firefox is your best bet for a Web browser. Its current version runs on Catalina and later. Many major third-party browsers now require Ventura or later, and Big Sur has not received the latest version of Safari for several years.

Downgrading to Catalina would not buy you much in performance, but would mean that you could not run current versions of LibreOffice or of the GNU Image Manipulation Program (GIMP). LibreOffice, GIMP, Affinity Studio, and GraphicsConverter 12 may be your main options for office & photo editing software – since vendors like Microsoft and Adobe whose policy is to support "the most recent three" moved on from Big Sur long ago.

FYI, Apple recently raised the minimum system requirement for iCloud to Mojave or later. A key security certificate expires at the end of January, and I'm not sure that any version of macOS older that Catalina will be getting a patch for that. So even though there are specific cases where one might want to stay on an old version of macOS (e.g. to run 32-bit games), trying to do work on anything earlier than Catalina is increasingly becoming a "bag of hurt".

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Answer 3

den.thed

Level 10

98,644 points

Oct 26, 2026 6:56 AM in response to thedogsbollock

It is not un-common for those older 21.5" iMac's to end life with a failing or failed internal hard drive.

At this point you can try reinstall an earlier OS X version, but it won't help if the hard drive is failing.

see > How to download and install macOS - Apple Support

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Answer 4

KiltedTim

Level 10

238,112 points

Oct 26, 2026 7:38 AM in response to thedogsbollock

I strongly suspect the hard drive is failing.

Though there are 'solutions' for that, it would be foolish to put any money at all into keeping that machine alive.

It is obsolete. Service and repairs are no longer available for it and it is not capable of running a supported version of macOS.

It had a good life. It's time to let it go.

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Answer 5

Allan Jones

Level 10

85,454 points

Oct 26, 2026 10:55 AM in response to thedogsbollock

21.5 inch mid 2014 iMac (1.4 Ghz Dual Core Intel i5)

You have one of the education/institutional iMacs made to appeal to budget conscience bulk buyers with limited needs for power computing.

To save US$200 on the retail price, Apple opted to:

— use a laptop-class 2-core processor at 1.4Ghz instead of the desktop-class 3.5Ghz 4-core processor used the the regular consumer 21.5-inch iMacs in Late 2014.

— use a processor with "integrated" graphics instead of the faster discrete graphics in the consumer model.

— use the older style iMac display with 103 pixels/inch rather than the 4K display at 218 ppi in the consumer more.

The above data are from the MacTracker database, free in the Mac App Store. Mactracker also has some benchmarking that shows how a $200 savings affected iMac performance in 2014:

The only thing that can help that model is the external SSD option mentioned.

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