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Cormorant

Command tools, threads and QoS

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Why is tar so slow to create a tar.gzip archive on a fast Apple silicon Mac? Is it being run at low QoS on the E cores? An explanation.

September 10, 2025 Macs, Technology

Save your M-series Mac’s energy and battery

How your Mac can use less energy and power, run its battery down less, generate less heat, and keep its P cores for the work you want it to do for you.

July 18, 2025 Macs, Technology

Updates for file integrity (Dintch/Fintch), compression (Cormorant) and LogUI build 70

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These updates feature overhauled windows, new app icons for compatibility with Tahoe, and have been rebuilt. LogUI gets a minor tweak that should improve its window controls in Tahoe.

July 14, 2025 Macs, Technology, Updates

Tune for Performance: Do you really need a big internal SSD?

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Why pay an extra $600 for a 2 TB internal SSD, after all fast external SSDs are cheaper. Maybe you need to check whether disk performance becomes a rate-limiting factor.

December 12, 2024 Macs, Technology

Tune for Performance: do more threads run faster?

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Discovering whether using more threads makes a task faster gives insight into where its performance is limited. How to use a VM to investigate this.

December 10, 2024 Macs, Technology

How to discover what Apple silicon CPU cores are doing

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How could you study how Apple silicon CPU cores are used to run code? Comparisons between Activity Monitor, Xcode Instruments, and powermetrics.

July 2, 2024 Macs, Technology

Updates: xattred 1.5, Cormorant 1.5, Metamer 1.2 and ArchiChect 2.5

Extended attribute editor with much enhanced interface, app inspection tool, compression tool designed for AirDrop use, and a simple extended attribute editor for Spotlight search.

May 26, 2023 Macs, Technology, Updates

Cormorant 1.4: getting more from Apple Archive

Now has three presets to control speed and energy consumption of compression and decompression, together with complete custom control.

May 12, 2022 Macs, Technology, Updates

Why more apps need speed controls

If apps control the Quality of Service, which sets how macOS allocates them to different processor cores in an M1 chip, how can we have any control?

April 27, 2022 Macs, Technology

How macOS controls performance: QoS on Intel and M1 processors

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Running processes at different Quality of Service affects their performance differently on Intel and M1 Macs. This explains what happens.

January 7, 2022 Macs, Technology

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