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Performance regression: Codex CLI startup significantly slower since 0.117.0 (macOS + Linux) #16388
Closed as duplicate
Description
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.
Environment
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Codex CLI version: 0.117.0+
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Platforms tested:
- macOS (Apple Silicon)
- Linux (x86_64)
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Reproducibility: 100%
What issue are you seeing?
codexstartup latency increased from ~instant to multiple seconds- Happens on every invocation
- Delay appears during initialization phase (before CLI becomes interactive)
Steps to reproduce
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Install codex >= 0.117.0
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Run:
codex
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Observe startup delay
Expected behavior
Startup should be near-instant (as in <= 0.116.0)
Actual behavior
Startup consistently takes several seconds before CLI becomes usable
Regression
- Last known good: <= 0.116.0
- First bad: 0.117.0
Activity
github-actions commentedon Apr 1, 2026
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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H3LLR00T commentedon Apr 1, 2026
I would like to work on this
audaki commentedon Apr 1, 2026
I can confirm this issue; 0.118 and 0.117 take pretty long on every single cli startup (2 seconds on a very very fast developer machine), whereas 0.116 is literally instant. We rolled back our codex installs to 0.116 for now.
@etraut-openai
Technically the issue you linked may be a duplicate, but the issue title of the other issue scopes it exclusively to only Windows, whereas this issue was related to Linux/Mac. Can you change the title of the other issue? Otherwise this is a bit confusing.