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Eric Traut
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## Why After the terminal-probe work in #23175, fresh-session startup still waits for `thread/start` before the chat input can become usable. The chat widget already has the machinery to hold early submissions until a session is configured, so fresh `thread/start` does not need to stay on the input-ready hot path. Refs #16335. ## What This PR starts fresh app-server threads in a background task, reports completion through a startup app event, and attaches the primary session once `thread/start` returns. Resume and fork startup paths remain synchronous. ## Benchmark In the local pty startup benchmark, this PR's pre-optimization base branch, #23175, measured about 152ms median from launch to accepted chat input. The stacked result measured about 66ms median, for an approximate additional savings of 85-95ms. For broader context, the original `main` baseline before either startup optimization was about 250.5ms median. We also measured Codex 0.117.0 on the same machine at about 64.6ms median, so the stacked branch is back in the old-startup-time range. ## Stack 1. [#23175: [1 of 2] Optimize TUI startup terminal probes](https://github.com/openai/codex/pull/23175) — base PR 2. [#23176: [2 of 2] Start fresh TUI thread in background](https://github.com/openai/codex/pull/23176) — this PR ## Verification - `cargo test -p codex-tui`
c0f7e1b99f
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2026-05-20 10:00:33 -07:00
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