macOS High Sierra Review: Compatibility, Features, and Performance

Overview and Summary

macOS High Sierra, released as the successor to macOS Sierra in 2017, introduced focused improvements to the core system rather than a broad set of user-facing features. Built on the same foundation as iOS and tvOS, High Sierra brought a refreshed Photos app, a new TV app to organize purchased and rented content, updates to Safari with smarter tracking prevention, and refinements to Messages and Mail. This evergreen profile explains compatibility, major changes, performance considerations, and practical upgrade guidance to help you decide whether High Sierra remains suitable for your Mac.

Key Features and User Experience

Photos and Media Apps

The Photos app received notable improvements, including a streamlined library, better search, and support for HEIF and HEVC formats to save storage. Apple also introduced a dedicated TV app, centralizing TV shows and movies from the iTunes Store, Apple Music, and third‑party providers. Notes and Messages gained richer media and editing tools, while Mail added data detectors for events and locations.

Safari and Security

Safari’s tracking prevention became more aggressive, limiting cross‑site tracking to improve privacy. System‑level changes included APFS as the default file system for supported Macs, offering better performance, reliability, and snapshots. Security updates, Secure Boot enhancements, and improved sandboxing aimed to reduce vulnerabilities and limit impact from exploits.

Performance, Reliability, and Battery Life

High Sierra generally delivered smooth performance on supported hardware, with app reinstallation via the App Store and faster software updates. APFS contributed to quicker file operations and more efficient storage use, which could help older Macs feel snappier. Battery life saw modest gains on laptops due to efficiency improvements, though the changes were evolutionary rather than revolutionary.

Compatibility and Supported Hardware

High Sierra expanded support to many Macs introduced in 2009 and later, with some exceptions. Before upgrading, users needed to verify that their Mac was on the compatibility list and had sufficient free storage, typically several gigabytes for the update and additional space afterward.

Upgrade Considerations and Best Practices

Because High Sierra is no longer the latest macOS, users should weigh the benefits of new features against the stability and compatibility they currently have. If you choose to upgrade, standard best practices apply: back up with Time Machine, verify app compatibility, and ensure firmware is up to date. On older Macs, it is often sensible to test the update on a secondary machine or an account first to confirm no regress in performance or peripheral support.

Summary Table: Key Facts at a Glance