Quick-start your Mac
1 Disable Login items
Open System Preferences > Users & Groups > Login Items to reveal a list of items that open when you log in. The more items, the slower your startup process will be. You might no longer be using some of these items. Clearing the checkbox doesn't stop the item from loading. Instead, select an unwanted item and click the ‘–’ button.
2 Don’t reopen windows
Choose > Shut Down and deselect the ‘Reopen windows when logging back in’ option. This prevents OS X wasting valuable time opening unwanted apps and windows. Click Cancel if you’re not ready to stop your Mac just yet; the option stays deselected until you re-enable it.
3 Fast user switching
This feature is handy in that one person can quickly do something in their account without disrupting another’s workspace, but it’s best if accounts aren’t left logged in on a Mac with limited system resources. It can be entirely disabled under Login Options in the Users & Groups pane.