What’s New in macOS High Sierra.
Apple introduced macOS High Sierra at its 2017 Worldwide Developers Conference in June. macOS High Sierra, as the name suggests, is a follow-up to macOS Sierra and is largely designed to improve on macOS Sierra through major under-the-hood updates and a handful of outward-facing changes.
With macOS High Sierra, Apple says it’s focusing on the fundamentals: data, video, and graphics. High Sierra is about deep technologies that will provide a platform for future innovation while also introducing new technologies to make the Mac more reliable, capable, and responsive.
A more modern file system, Apple File System (APFS), is the new default in macOS High Sierra. APFS is safe, secure, and optimized for modern storage systems like solid state drives. It introduces features like native encryption, safe document saves, stable snapshots, and crash protection. APFS is ultra responsive and will bring major performance improvements for Macs.
High Sierra includes High-Efficiency Video Encoding (HEVC, aka H.265), which preserves better detail and color while also introducing much-improved compression compared to H.264. HEVC software encoding is available for all Macs in High Sierra, but newer models include HEVC hardware acceleration.
Along with a new Apple File System, macOS High Sierra introduces Metal 2, the next-generation version of Apple’s Metal graphics API. Metal offers up to 10x better draw call throughput improvements like driver optimizations, indirect argument buffers, sampler arrays, resource heaps, and more. The Mac’s window server uses Metal 2 optimizations to make window animations like Mission Control much smoother.
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