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430•08/22/2026, 17:00•1 min read

Charlie Marsh Optimizes Codex CLI Startup Speed

Executive TL;DR30s read

Charlie Marsh, a renowned developer, has optimized the startup speed of Codex CLI, achieving an impressive increase in performance. This opens new possibilities for users.

Charlie Marsh, the author of the famous Python tool uv and one of the strongest Rust developers, has already made his mark after joining OpenAI.

He directly optimized the startup speed of Codex CLI, speeding it up by 25 times, achieving almost instantaneous startup. 🤩

We can accelerate this even further. — he writes.

Why it matters

Analysis

This is important because optimizing the startup speed of tools can significantly enhance developer productivity and ease their workflow. Innovations in this area open up new possibilities for utilizing AI technologies.

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