[Solved] Logic Pro ‘System Overload. The audio engine was not able to process all required data’ on macOS Sequoia 15.1 + Logic Pro 11.0.1: Diagnostic steps and permanent fix

[Dennis Koenig]

Diagnostic Hardware Specs: MacBook Pro 16″ M1 Max | OS Version: macOS Sequoia 15.1 + Logic Pro 11.0.1 | Archive Source: Apple Support Community #256020988

I am running into a persistent issue on my MacBook Pro 16″ M1 Max running macOS Sequoia 15.1 + Logic Pro 11.0.1.
Whenever the machine encounters CoreAudio thread scheduling buffer underrun with third-party AU plugins (-10011), the following diagnostic log appears in Console:

CoreAudio: [com.apple.coreaudio] Logic Pro audio processing thread #2 exceeded buffer latency budget (-10011)

I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

Apple TV 4K 3rd Gen | Dual HomePod mini | iPhone 15 Pro Max | Pittsburgh, PA

Smart Home & Matter/Thread Integrator | "Verified Apple Discussions Archive"

[Terry Phillips]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Increasing I/O buffer sample size, maximizing processing threads, and freezing high-CPU synth tracks.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. Navigate to Logic Pro > Settings > Audio > Devices and set I/O Buffer Size to 512 samples (or 1024 for mixing).
2. Set Processing Threads from ‘Automatic’ to the maximum available performance cores.
3. Enable Track Freeze on tracks with resource-heavy synthesizers or convolution reverbs.

Following this procedure restores full stability with zero recurring log errors.

Mac mini M4 (24GB) | PreSonus Quantum HD 8 | Audio-Technica ATH-R70x | Rotterdam, NL

Apple Certified Support Professional (ACSP) | Classical Pianist & Spatial Audio Arranger

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