Mac coreaudiod High CPU Usage — What It Means & How to Fix It

Fix macOS coreaudiod process consuming high CPU and causing audio glitches, crackling, or fan noise due to audio subsystem issues. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: coreaudiod is the macOS core audio daemon responsible for all audio input and output processing. When coreaudiod consumes excessive CPU, audio becomes glitchy with pops, crackles, or dropouts. The issue can be triggered by audio device changes, Bluetooth audio connections, or buggy audio plugins. Aggregate audio devices and multiple audio interfaces can stress coreaudiod. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Bluetooth audio device (AirPods, speakers) failing to maintain a stable connection. Audio plugin or virtual audio driver (Soundflower, BlackHole, Loopback) malfunctioning. Sample rate mismatch between the audio source and the output device. macOS audio routing becoming confused after connecting/disconnecting multiple audio devices. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Restart coreaudiod: sudo killall coreaudiod (it will restart automatically). Open Audio MIDI Setup (in /Applications/Utilities) and verify all devices show correct sample rates. Disconnect Bluetooth audio devices and test with built-in speakers to isolate the issue. Remove any virtual audio drivers (BlackHole, Soundflower) and test if the issue resolves. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

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