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Tweaked login screen
OS X Mavericks has a different login screen to differentiate it from older versions of the Mac desktop operating system. It may change in later builds, but for now it is cleaner and simpler, with a "flatter" Apple logo above the usernames.
This slideshow was first published in August 2013. It has been updated and republished on October 22, at its official launch in San Francisco, California, to reflect changes and additions.
App Nap helps save battery life
App Nap helps to save battery power by "slowing down" applications that are not being used, or hidden by other windows. With Safari, CPU energy can be reduced by almost one-quarter, which helps to conserve battery charge throughout the day. According to Apple, as soon as you start to use it again, the application instantly and seamlessly shifts back to full speed.