Claude Code 已改用 Rust 版 Bun，启动速度提升 10%

在《在 Rust 中重写 Bun》中：https://bun.com/blog/bun-in-rust，Jarred Sumner 做出了以下声明：

Claude Code v2.1.181（发布于6月17日）及之后版本使用了 Bun 的 Rust 移植版。在 Linux 上启动速度提高了 10%，但除此之外，几乎没人注意到。无聊也是好事。

我决定检查一下我自己的 Claude Code 安装，以看看是否能找到证据表明它使用了用 Rust 编写的 Bun。

我发现这两个命令令人信服：

对我来说，这输出了 Bun v1.4.0（macOS arm64）。Bun 在 GitHub 上的最新发布版本：https://github.com/oven-sh/bun/releases 目前是 v1.3.14：https://github.com/oven-sh/bun/releases/tag/bun-v1.3.14，日期为5月12日，因此 Claude 中显示的 v1.4.0 版本号支持他们发布了一个尚未发布的 Bun 版本预览。

（更新：Rust 版本已作为 Bun canary 发布：https://bun.com/docs/installation#canary-builds - 运行 bun upgrade --canary 将安装此版本：https://github.com/oven-sh/bun/releases/tag/canary。）

这会输出一个由 563 个文件名组成的列表：https://gist.github.com/simonw/c92fb0f67b114ac26e3b95a09ddccfdc，以以下内容开头：

看起来用 Rust 编写的 Bun 确实在数百万不同设备上投入生产使用。正如 Jarred 所说，“无聊是好事”。

更新：这是 Ajan Raj 的一个巧妙技巧：https://twitter.com/ajanraj25/status/2078825794701242697：

这是 5 月 17 日的提交：https://github.com/oven-sh/bun/commit/b18bf6d1d0a92238f240bfd125f0e3b3461b9243#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519，将 package.json 中的版本更新为 1.4.0。自那以后该版本未再更改，但也尚未进入 canary 之外的标记发布版本。

这是 Simon Willison 于 2026 年 7 月 19 日发布的一条笔记：/2026/Jul/19/。

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In Rewriting Bun in Rust：https://bun.com/blog/bun-in-rust Jarred Sumner made the following claim:

Claude Code v2.1.181 (released June 17th) and later use the Rust port of Bun. Startup got 10% faster on Linux but otherwise, barely anyone noticed. Boring is good.

I decided to have a poke at my own Claude Code installation to see if I could find evidence that it was using Bun written in Rust.

I found these two commands convincing:

For me this outputs Bun v1.4.0 (macOS arm64) . The most recent release of Bun on GitHub：https://github.com/oven-sh/bun/releases is currently v1.3.14：https://github.com/oven-sh/bun/releases/tag/bun-v1.3.14 from May 12th, so that v1.4.0 version number in Claude supports them shipping a preview of a not-yet-released Bun version.

( Update : The Rust version has been released as Bun canary：https://bun.com/docs/installation#canary-builds - running bun upgrade --canary will install this release：https://github.com/oven-sh/bun/releases/tag/canary.)

This outputs a list of 563 filenames：https://gist.github.com/simonw/c92fb0f67b114ac26e3b95a09ddccfdc, starting with these:

It looks like Bun in Rust is indeed being run in production across millions of different devices. Like Jarred said, "Boring is good".

Update : Here's a neat trick from Ajan Raj：https://twitter.com/ajanraj25/status/2078825794701242697:

Here's the commit from May 17th：https://github.com/oven-sh/bun/commit/b18bf6d1d0a92238f240bfd125f0e3b3461b9243#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519 that updated the version in package.json to 1.4.0. That version hasn't been changed since then, but also hasn't yet made it into a tagged release outside of canary .

This is a note by Simon Willison, posted on 19th July 2026：/2026/Jul/19/.

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