Switch to the Login Items tab to see-and change-the programs that get to start automatically. Open System Preferences from the Apple menu, then click Users & Groups and select your account. Limit the programs that start up with macOS. Taking more control over which programs launch at startup can claw back some of the performance you’ve lost. The problem strikes when too many software programs and utilities load themselves into memory, which makes the computer’s startup last longer and limits the amount of CPU and RAM available for the applications you actually want to use.
This can often be useful-something like Dropbox, for example, needs to be up and running all the time to keep your files synced up and ready. This automatic launch gives them a head start over other programs and ensures they’ll always be available to you. Many applications want to load at least part of themselves into memory as soon as macOS starts.
Prevent programs from launching at startup
