Introduced App Nap to reduce energy use by sleeping background apps, Compressed Memory to speed up data handling, and Timer Coalescing to increase CPU idle time.
Common image types and their roles
: If you previously "purchased" Mavericks (even for $0), it remains available in your tab on older Macs. Internet Archive : Community members have uploaded verified Mac OS X 10.9 Mavericks Installers 10.9.5 ISO/DMG files for preservation. Spiceworks Community How to Create a Bootable USB from the DMG mavericks os x 10.9.x dmg