Explore the world of Mac. Check out MacBook Pro, iMac Pro, MacBook Air, iMac, and more. Visit the Apple site to learn, buy, and get support. Final thoughts on how to fix Mac running slow. So we have run over the main methods to speed up a slow Mac. They all boil down to one simple idea: give your Mac some space to breathe. Eventually, any Mac is going to fill up with all kinds of garbage that's consuming resources, memory and disk space.