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Bun previews faster release with HTTP/3
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X · X// 3h agoPRODUCT UPDATE

Bun previews faster release with HTTP/3

Bun is previewing the next version of its JavaScript runtime with a cluster of infrastructure and performance upgrades aimed at real-world workloads. The list includes a global `bun install` virtual store that reduces disk usage, HTTP/3 support for `Bun.serve()` and `fetch`, HTTP/2 fetch, reduced RAM usage in `node:tls`, and stability fixes for `Worker`, `MessagePort`, and `BroadcastChannel`. The follow-up thread also adds a notable extra: 30% faster ESM.

// ANALYSIS

Bun is still doing what Bun does best: shipping runtime-level improvements that compound across the whole stack instead of polishing one surface area at a time.

  • The headline changes are practical, not cosmetic: lower disk usage, lower memory usage, and faster module loading all matter for CI, local dev, and production containers.
  • HTTP/3 and HTTP/2 fetch push Bun further into “default backend runtime” territory, especially for teams leaning on standards-based networking.
  • The stability fixes suggest the runtime is continuing to harden around concurrency and messaging primitives, which is where user trust tends to break first.
  • The “30% faster ESM” note is the kind of late-breaking performance win that can materially change adoption for large codebases.
  • This reads more like a release preview for serious users than a launch announcement for casual developers.
// TAGS
bunjavascriptruntimehttp3http2esmperformancenetworkingopensource

DISCOVERED

3h ago

2026-05-01

PUBLISHED

3h ago

2026-05-01

RELEVANCE

9/ 10

AUTHOR

jarredsumner