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A lot of unwanted processes are happening in the background on your Mac. These processes are invisible to you until you open the Activity Monitor. Unwanted apps start up automatically when you open your Mac to perform better with apps you use. Browser extensions can drain as much battery or memory of your Mac as a regular app. You should only keep plugins you require and delete the ones you don’t. Your Mac’s storage is almost full with a least 128GB of storage and go all the way to 4TB.