Apple’s refresh to the Mac mini may have caused some owners of earlier generations to be envious of the performance compared to their existing Mac. One potential upgrade to give the older models a speed boost is to switch out the mechanical hard drive for an SSD, a task that isn’t as hard to do as people may think.
Source: macinsider

How to give your 2012 or 2014 Mac mini a performance boost by replacing the hard drive with an SSD
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