Empty Trash Automatically: Anything in your Trash will be deleted after 30-days.Only recent Mail attachments will be stored on your Mac when storage is low. Optimize Storage: Enable this and in the future, iTunes movies and TV shows you’ve watched already won’t be kept on your Mac.Store in iCloud: Stores all your Photos images and videos in iCloud and lets you reduce the size of the collection kept on your Mac.Tap this, and you’ll find a series of ideas to help you eliminate space wasting items from your Mac, likely to include: Tap these to get more information and to find app-specific recommendations. Here you’ll see a selection of different items (Mail, iTunes, iCloud Drive, among others). That’s interesting, but to get to the tools tap Manage. Wait a few moments, and you should see a visual representation that shows what is taking up space on your system. Open About this Mac in the Menu and tap Storage to access these. MacOS has some really helpful built-in tools to help you boost Mac performance by getting rid of items you no longer need.