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Performance has been improved - and will tick up further as more developers begin to use Apple's Metal programming interface - and tiny quality-of-life improvements have wormed their way into most every native app on the platform. There are of course refinements to discover, including improved takes on multitasking and more efficient ways to search.
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Where Yosemite was concerned with introducing new features to modernize the OS, El Capitan, like its namesake pillar, sits upon that foundation. The previous version of OS X, called Yosemite, represented a sea change for OS X, sporting all new aesthetics, features such as Continuity and Handoff that bridge the gap between iOS devices like your iPhone, and Spotlight's newfound ability to search pockets of the Web.
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