It seems like so long ago, but there was a time when your Mac was fast. These days, though, using your favorite computer is a sloth. Your Mac has slowed down with age. A part of the problem may be the apps you’ve downloaded to it. Thankfully, writer Matt Elliott with CNET has a solution: It’s time for you to download System Lens, an app that lists the apps running on your device and the amount of resources they are consuming.