微軟花 12 萬美元讓 AI 重寫 Copilot 運行時：43 萬行 TS 變 80 萬行 Rust，快 15.9 倍
微軟用AI代理將GitHub Copilot運行時從TypeScript全量移植到Rust，僅花約12萬美元token成本和一名工程師三週。該運行時支撐Copilot CLI、App、SDK及雲Agent，覆蓋VS Code、Visual Studio、Excel、Outlook、PowerPoint等微軟產品。原TypeScript/Node.js開發快，但規模化後啓動速度和服務性能受限。
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