The FTP and telnet command line programs were removed.

The time service ntpd was replaced with timed for the time synchronization. The Low Battery notification and its icon were replaced by a flatter modern look. Kernel extensions ('kexts') will require explicit approval by the user before being able to run. HEVC hardware acceleration requires a Mac with a sixth-generation Intel processor or newer (late 2015 27-inch iMac, mid 2017 21.5-inch iMac, early 2016 MacBook, late 2016 MacBook Pro or iMac Pro). In addition, audio codecs FLAC and Opus are also supported, but not in iTunes. However, whenever an Intel IGP is present, the frameworks will only direct requests to Intel IGP. Macs with the Intel Kaby Lake processor offer hardware support for Main 10 profile 10-bit hardware decoding, those with the Intel Skylake processor support Main profile 8-bit hardware decoding, and those with AMD Radeon 400 series graphics also support full HEVC decoding. MacOS High Sierra adds support for High Efficiency Video Coding (HEVC), with hardware acceleration where available, as well as support for High Efficiency Image File Format (HEIF). The system's windowing system, Quartz Compositor, supports Metal 2. It includes virtual-reality and machine-learning features, as well as support for external GPUs. Metal, Apple's low-level graphics API, has been updated to Metal 2. It also has built‑in encryption, crash‑safe protections, and simplified data backup on the go. It supports 64‑bit inode numbers, is designed for flash memory, and is designed to speed up common tasks like duplicating a file and finding the size of a folder's contents. Changes System Apple File System Īpple File System (APFS) replaces HFS Plus as the default file system in macOS for the first time with High Sierra. This requires using a patch to modify the install image. It is possible to install High Sierra on many older Macintosh computers that are not officially supported by Apple. MacOS High Sierra requires at least 2 GB of RAM and 14.3 GB of available disk space. MacOS High Sierra is supported on the following Macintosh computers: 2.2.8 Other applications found on macOS 10.13 High Sierra.

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