To skip the song and dance, I have an late 2012 21.5” iMac I thought I’d spruce up and use in the garage, I upgraded the spinning drive to a WD Blue 1TB, I upgraded the ram to 16GB of DDR3 and I upgraded the CPU from the i5 to an i7.
As a test I installed the latest version of Mac OS (to do firmware updates) and found this to be incredibly slow, much slower than I anticipated. I installed Linux Mint and it ran a bit better, but it was much slower than I anticipated. I found the CPU was turbo’ing as expected and everything seems to be in good order. I’m running out of ideas. Any help would be much appreciated!

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