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Codex CLI developers claim startup speed is about 25 times faster.
Charlie Marsh stated that he redesigned the startup lifecycle in the latest version of the Codex CLI, enabling tools to respond instantly and reportedly improving startup speed by approximately 25 times.
Developer Charlie Marsh stated that he redesigned the startup lifecycle in the latest version of the Codex CLI, enabling the CLI to enter an interactive state more quickly after startup.
Marsh claims the new process starts up approximately 25 times faster than before. This figure is currently based on developer testing and no independent benchmarks with similar metrics have been found; the original documentation also does not explicitly specify a corresponding official release number.
refer to:Developer Notes