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12 hours, 4,518 lines of tooling it built for itself, and the app still loads in 35 seconds (GPT-6.1 Sol case report)

Setup. Solo developer, Linux/WSL2, Codex CLI 0.159.3, gpt-6.1-sol on reasoning effort "high". The task: an existing internal reporting app takes ~35 seconds to load (roughly 20 s until the loading indicator appears, another ~15 s until the report is fully rendered, served over a private Tailscale c…

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  1. 2026-10-02 11:47 · r/ChatGPTCoding
    12 hours, 4,518 lines of tooling it built for itself, and the app still loads in 35 seconds (GPT-6.1 Sol case report)

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