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mini mac late 2012 Why is it starting to slow down?

I Recommend Upgrading To 8GB Ram And A Solid State Drive That Would Make You Mac Mini Run Smoother Especially If You Are On Mac OS X 10.12.0 Or Above

You hard drive is to full. Anytime you get a drive more than 80% filled it will start to slow down. Standard RAM: 4 GB Maximum RAM: 16 GB Details: By default, 4 GB is installed as two 2 GB modules. This model supports 16 GB of RAM using two 8 GB modules. I would also recommend a Seagate SSHD 1 TB. Use the existing drive for storage. Or adding a smaller SSD drive and turning it into a Fusion Drive. But you may to clean up the drive and eliminate duplicate items or whatever is taking up your HD space. Here’s how to add the second drive. Installing Mac Mini Late 2012 Dual Hard Drive Kit