Arrange your files and folders by size to find the biggest.It might take a while, so here's a piece of advice on how to approach it. If you see the top bar getting full, like in the screenshot below, it's time to clean up some space. To find out how cluttered yours is, click on the main Apple menu in the top left corner and choose About This Mac > Storage. One of the reasons a Mac gets slow is a full hard drive. Check the unnecessary apps and click.ĭon't worry, if you accidentally remove something useful, just add it back by clicking and choosing it from the Applications folder. To stop them from launching on startup, go to System Preferences, choose Users & Groups and then click your username. This could be one of the reasons El Capitan running slow. And you probably don't need most of them at that moment. When you turn your Mac on, it typically launches a dozen apps at once.
