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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.
More iCloud integration
A number of in-built apps are now compatible with iCloud storage, including Automator and AppleScript Editor, suggesting a greater integration of software and services with the desktop platform.
Apple Maps to the desktop
In spite of its rocky start on its mobile devices, Apple has brought its Maps apps to the desktop. It includes all of the features from the mobile app, such as 3D maps, local information, and driving directions.