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Codex Issues / #27576

Codex CLI extremely slow today: simple turns take 9-10 minutes despite high-tier subscription

Resolved 💬 3 comments Opened Jun 11, 2026 by simfor99 Closed Jun 11, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

Summary

Codex CLI is extremely slow today. Simple assistant turns that should take seconds are sometimes taking 9-10 minutes before a usable answer comes back. This is happening despite using a high-tier Codex subscription / 20x plan.

Environment

  • Codex CLI: codex-cli 0.139.0
  • OS: Ubuntu 24.04.3 LTS on WSL2
  • Kernel: 6.6.87.2-microsoft-standard-WSL2
  • Date observed: 2026-06-11

Observed behavior

  • Very simple chat responses can take 9-10 minutes.
  • The slowdown is severe enough that I had to abandon a previous session and start a fresh one.
  • Local shell commands themselves appear to return normally; the painful delay is in Codex CLI assistant responsiveness / turn completion.

Expected behavior

Simple assistant turns should complete in seconds or at least within a predictable short latency window, especially on a higher-tier subscription.

Impact

The CLI becomes difficult to use for normal coding and planning work when each small response can take close to ten minutes.

Related context

I found several related open performance issues, but they do not exactly match this report:

  • #26766: Codex Desktop in WSL mode takes 1-2 minutes per response when plugins are enabled
  • #25715: Codex App is unusably slow with WSL as agent environment
  • #23807: codex-cli stalls for exactly 300s between tool result and next model request

This report is specifically about extreme latency today, with some simple turns taking 9-10 minutes.

Request

Could the team please check whether there is a current service-side, routing, subscription-tier, or CLI regression causing this? If there are diagnostics I should collect from the CLI, please let me know which command/logs are most useful.

View original on GitHub ↗

3 Comments

github-actions[bot] contributor · 2 months ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

  • #26121
  • #26766
  • #27240
  • #26775
  • #27531

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simfor99 · 2 months ago

Reviewed the duplicate candidates from the GitHub Actions bot. This report is likely covered by existing issues:

  • #27240 covers the closest technical shape: Windows/WSL agent environment with severe per-turn latency, including trivial prompts.
  • #27531 appears to cover the current 2026-06-11 GPT-5.5/Fast/high-tier speed degradation angle.
  • #26766 may be related when plugins/WSL startup scanning are involved, though my report did not yet isolate plugins.

To avoid fragmenting the investigation, I am closing this issue as a duplicate / consolidation candidate. If maintainers need CLI-specific diagnostics for codex-cli 0.139.0 on WSL2, I can add them to the preferred tracking issue.

simfor99 · 2 months ago

Closing as duplicate/consolidation candidate after reviewing the bot-suggested issues.