Performance regression: Codex CLI startup significantly slower since 0.117.0 (macOS + Linux)

Description

Since upgrading to 0.117.0 and later, Codex CLI startup has become significantly slower.

This regression is reproducible across both macOS and Linux, suggesting it is not platform-specific.

Previously, launching codex was near-instant.
Now it consistently takes several seconds before becoming usable.

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Environment

• Codex CLI version: 0.117.0+
• Platforms tested:

• macOS (Apple Silicon)
• Linux (x86_64)
• Reproducibility: 100%

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What issue are you seeing?

• codex startup latency increased from ~instant to multiple seconds
• Happens on every invocation
• Delay appears during initialization phase (before CLI becomes interactive)

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Steps to reproduce

1. Install codex >= 0.117.0
2. Run:

``bash
codex
``

1. Observe startup delay

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Expected behavior

Startup should be near-instant (as in <= 0.116.0)

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Actual behavior

Startup consistently takes several seconds before CLI becomes usable

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Regression

• Last known good: <= 0.116.0
• First bad: 0.117.0

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