🚀Bun 1.4 Adds 2900 Fixes and Major Performance Gains
Bun's latest release is a game-changer for performance
TL;DR
Bun 1.4 slashes CPU usage by 5x and memory consumption by up to 35%, with faster startup times on Linux and Windows. It also passes 97% of Node.js tests out-of-the-box.
Bun 1.4 is here, bringing over 2,900 bug fixes and a host of performance improvements. The new version slashes idle CPU usage by up to 5x and reduces memory consumption by up to 35%. It starts 50% faster on Linux and 2.5× faster on Windows. If you're building full-stack JavaScript apps, this release is a must-have for anyone looking to optimize their development workflow. With 1.4, Bun now passes 97% of Node.js tests out-of-the-box, making it more compatible than ever before.

Key Points
Bun 1.4 adds +1,517 tests from the Node.js test suite, ensuring near-total compatibility.
Over 2,900 issues are fixed in Bun 1.4, addressing a wide range of bugs and performance bottlenecks.
CPU usage drops by up to 5x for both large apps and small 'hello world' projects with Bun 1.4.
Memory usage is reduced by up to 35% on Linux and Windows, making Bun more efficient than ever before.
Bun starts 2× faster on Linux and 2.5× faster on Windows, cutting down development time.
Why It Matters
If you're building full-stack JavaScript apps with Next.js or Vite, Bun 1.4's performance gains can significantly reduce your CPU and memory usage. For example, a large long-running application built on Bun saw its production CPU usage drop by 2×. But remember: the benefits only kick in if you switch to Bun 1.4.
Frequently Asked Questions
Why does this matter?
If you're building full-stack JavaScript apps with Next.js or Vite, Bun 1.4's performance gains can significantly reduce your CPU and memory usage. For example, a large long-running application built on Bun saw its production CPU usage drop by 2×. But remember: the benefits only kick in if you switch to Bun 1.4.
What happened?
Bun 1.4 slashes CPU usage by 5x and memory consumption by up to 35%, with faster startup times on Linux and Windows. It also passes 97% of Node.js tests out-of-the-box.
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