The M4 Mac mini came with a surprise — a slotted and upgradeable SSD. Here's how to install one, get it running, what to expect for speed, and what's happened in the last eight months since upgrading.

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A powerful Mac can still feel slow when your workflow gets messy. Photo: D. Griffin Jones/Cult of Mac A year into owning an M4 Pro Mac mini, it began feeling slow. With dozens of Chrome tabs and ...