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. APFS is ultra responsive and brings major performance improvements for Macs. It introduces features like native encryption, safe document saves, stable snapshots, and crash protection.

APFS is safe, secure, and optimized for modern storage systems like solid state drives. High Sierra is about deep technologies that provide a platform for future innovation while also introducing new technologies to make the Mac more reliable, capable, and responsive.Ī more modern file system, Apple File System (APFS), is the new default in macOS High Sierra. With macOS High Sierra, Apple says it's focusing on the fundamentals: data, video, and graphics. 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. Apple introduced macOS High Sierra at the 2017 Worldwide Developers Conference in June.

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