macOS 14 - 20250225.952 performance degradation

[arthurkuhn]

Description

We have observed performance degradation for iOS test execution on macOS 14 agents, more specifically since the rollout of version 20250225.952 (#11671). It is now reproing consistently since Feb 28th PST. There has been no significant changes to our setup in > 1 week.

Noted similar issue tracked in (#11509). Creating a new issue since latest version is affected

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 20.04
• Ubuntu 22.04
• Ubuntu 24.04
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• Windows Server 2019
• Windows Server 2022
• Windows Server 2025

Image version and build link

Failing

Image: macos-14-arm64
Version: 20250225.952
Included Software: https://github.com/actions/runner-images/blob/macos-14-arm64/20250225.952/images/macos/macos-14-arm64-Readme.md
Image Release: https://github.com/actions/runner-images/releases/tag/macos-14-arm64%2F20250225.952

Failing run link

Note performance degradation causing timeout to be hit

Passing

Image: macos-14-arm64
Version: 20250120.774
Included Software: https://github.com/actions/runner-images/blob/macos-14-arm64/20250120.774/images/macos/macos-14-arm64-Readme.md
Image Release: https://github.com/actions/runner-images/releases/tag/macos-14-arm64%2F20250120.774

Passing run link

Is it regression?

Yes

Expected behavior

No performance regression

Actual behavior

Performance Degradation

Repro steps

Use latest macOS-14 image
Notice runs are slower