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To replace my mid-2011 iMac (12 GB RAM, 2.7 GHz i5, Radeon 512 MB), whose Radeon Graphics card is slowly passing away, I purchased a mid-2011 Mac mini (10 GB RAM, 2.5 i5, Radeon 256 MB) with same HD capacity, and carried over my data with Time Machine.

After successfully repairing an issue with the Startup Volume in Recovery mode, I am finding the mini to be incredibly slow to do anything. For example, opening a Finder window takes a good 2 minutes. Even my mom's never-upgraded 2009 iMac is much, much faster with lesser specs.

Since I migrated the data from a (rather fast) iMac, I am ruling out malware or system cache issues. I didn't see anything peculiar in Activity Monitor and Disk Utility says all is okay.

Here is the detail of the HD and the RAM installed.

My first suggestion would be that the culprit is the Ram that is installed being from different vendors and capacity, but I am baffled to find out how I could be sure that this is the problem before I open it up in case I have to return it.

What is possibly making this Mac mini so slow and how can I know for sure?

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    If you suspect the RAM, can't you try moving the RAM from the iMac to the Mini? – lhf Aug 18 '20 at 21:25
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    The RAM seems to be compatible. See everymac.com/systems/apple/mac_mini/specs/… – lhf Aug 18 '20 at 21:44
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    See also what etrecheck.com report for the Mini – lhf Aug 18 '20 at 21:44
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    I would look deeper into the hard drive issue. Open Terminal and issue the following command: diskutil info disk0 | grep -i SMART. If it says "Verified" you're not out of the woods just yet, you'll want to do some more diagnostics. However, if it says failing, it's time for a new drive. However, given that it's a 5400RPM 9+ year old spinning drive, why not upgrade it and be done? – Allan Aug 18 '20 at 23:45
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    Wait...there’s two drives? Can you post the output of diskutil list To your question? The Windows is probably boot camp which is a popular thing to do...it’s not necessarily another drive. – Allan Aug 19 '20 at 3:40

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