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Bun 1.4
Bun 1.4 doubles startup speeds and cuts idle CPU usage by 5x while migrating its core engine from Zig to Rust.
What: Bun 1.4 adds compatibility for 1,517 additional Node.js test cases, introduces native image processing and WebView support, and improves memory efficiency by utilizing a scavenger thread and mimalloc memory allocator.
Why it matters: The transition from Zig to Rust and the integration of advanced memory management indicate Bun is maturing toward long-term stability for resource-intensive server-side workloads.
Takeaway: Run `bun upgrade` to update to version 1.4 and leverage the improved memory management and Node.js API support.
Decoder
- Zig: A general-purpose programming language focused on manual memory management, which Bun was originally written in.
- Mimalloc: A high-performance memory allocator developed by Microsoft that reduces memory fragmentation.
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