SLOW 2017 Imac 21.5

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Hi folks, I’m new to the forum and I have a 2017 Imac that has never had the performance I expected from one of these machines. I was a Windows user from 1995 until 2017 and regarded the Mac as ‘legendary’ partly due to colleagues’ input. It had a 3 year warranty, however due to ‘life’ (including my wife’s serious illness since 2019) and I did not address the problem properly until last week.
The machine is abysmally slow, booting up, starting up apps and then in their operation. (I sometimes have to wait for a word to finish when typing in Pages) I took it to the local store and they tested it, stating it passed the tests, and then installed a new operating system. As I began to set it up at home, it <seemed> a little better, almost livable, but today it’s back to its old tricks. I’m not excited about buying a new machine, not only because it’s unpleasant to use, and I’ve been using the Mac for photo storage with 2-2T auxiliary drives.
I was wondering if there is a way to upgrade/modify the hardware itself. I used to do that with my Windows machines and it made them useful for a much longer time. If I could get this to run faster, so I’m not watching the “color wheel” most of the time, I would probably be ok.
I’ve never used this machine on a regular schedule, partly because it’s located in a spare bedroom and I hate waiting for it to perform. I use my IPAD Pro for 95% of my computer activity and speed is never a problem.
Finally I received a ‘feedback’ form from Apple regarding the recent repair effort. I provided them with similar info as this post, tho’ I doubt I will hear from them.
Thank you all in advance for any recommendations/experiences you may have.
 
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Sounds like your 2017 iMac has a spinning hard drive in it. The newer OS's use APFS which takes a toll on spinning drives.

I have upgraded a bunch of these for people by setting up a Sandisk Pro G40 SSD as the boot drive, then set the internal drive for Time Machine. The Pro-G40 is a Thunderbolt SSD that has speeds of over 2000MB/s vs the 85mb/sec or less that the are getting from the internal spinning drive.

You will go from taking about 8 minutes to boot to under 30 seconds, and apps will just spring open.

You can purchase the Sandisk Pro-G40 at Amazon.
 
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MacsBug, that sounds like a great, hassle free solution for breathing new life into an old Mac desktop.
Do you bother to transfer the user data from the HDD as well or just use the SSD as a boot drive?
 
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The way that I have set this up for several people is that I use Carbon Copy Cloner to clone the OS and data files to the new external drive. Just note that this can take HOURS based on the fact that the internal spinning drive will be painfully slow at about 35mb/sec when moving the data.

It will feel like having a new computer without the expense.
 
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Chasboy, even taking into account the possibility of APFS on current macOS it does sound incredibly slow. One of the major causes is exceeding storage limitations. For example if more than 80% of your internal storage is in use you will see a drop in performance not mention running 2 X 2TB externals.

You could as you suggested upgrade both the HD to an SSD and increase the RAM with kits from reputable vendors like Crucial, see:. https://www.crucial.com/compatible-upgrade-for/apple/imac-(retina-5k--27-inch--2017)-imac18-3

But, MacBug's solution is a lot simpler and probably cheaper.
 
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The way that I have set this up for several people is that I use Carbon Copy Cloner to clone the OS and data files to the new external drive. Just note that this can take HOURS based on the fact that the internal spinning drive will be painfully slow at about 35mb/sec when moving the data.

It will feel like having a new computer without the expense.
Do you create a Bootable Clone using CCC's legacy method?
 
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It really depends on the OS. If you have Catalina or earlier then you don't need to use the legacy bootable copy feature, If you have Big Sur or later, then its a must.
 

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