Can you remember the last time you wiped your MacBook and reinstalled everything? I'd guess somewhere around "never," but there are plenty of reasons you might want to Exterminatus your system, ranging from the serious (a major error with macOS) to the so-so (your system feels sluggish after all the crap you've put on it over the last three years).
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Mac: There's a lot you can do to improve gaming performance on the Mac, but a lot of it starts with benchmarking your current performance. Count It is a framerate counter that can help you figure out what's dragging your performance down, and what tweaks boost it.