Codex subagent concurrency can be raised to 64, at a UI cost

A hidden config.toml setting lets Codex run up to 64 concurrent subagents instead of the default 3, but testers report UI lag likely caused by local CPU overload at maximum concurrency.

2026-09-07 ~ 2026-09-07 · 2 related posts

• Codex defaults to 3 subagents — one config.toml line raises concurrency to 64 — daniel_mac8 · 2026-09-07
• Follow-up: running 64 concurrent Codex subagents makes the UI laggy, likely CPU overload — daniel_mac8 · 2026-09-07