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Topics: JavaScript Full archive →

The Wire · Showcase

VERCEL SHRINKS TURBOPACK MEMORY FOOTPRINT BY HUNDREDS OF MEGABYTES

By RepoJournal · Filed · About Vercel

lukesandberg gscho vvo SyMind wbinnssmith karthikscale3 sampoder
7 people shipped this
lukesandberg @lukesandberg 1 cited gscho @gscho 1 cited vvo @vvo 1 cited SyMind @SyMind 1 cited wbinnssmith @wbinnssmith 1 cited karthikscale3 @karthikscale3 1 cited sampoder @sampoder 1 cited

Next.js just cut RawVc in half and CellId by a third, removing massive chunks of peak RAM from large apps.

The turbo-tasks optimization [1] hand-packs RawVc from 16 bytes down to 8 and CellId from 6 bytes to 4, targeting the type-erased representations that live in huge numbers across cache keys and task storage. This isn't theoretical: on real, large applications, the reduction removes hundreds of megabytes of peak RSS. The change lands alongside arena-allocated Effects [11] as part of a systematic push to make Turbopack leaner. On the CLI side, Vercel shipped cleanup across three fronts: removal of the never-released Functions Beta flag infrastructure [3], [2], fixture updates to align with the API's deprecation of public deployments [4], and critical fixes to blob store commands that were hanging agents in non-interactive mode [5]. Next.js itself is moving faster on the Rspack 2.0 upgrade [6], now building locally with synced Rust bindings, and experimental React compiler support just landed in Turbopack [7] to run the compiler directly on swc AST without gen-and-reparse overhead. Workflow 4.5.0 replaces the problematic `hook.hasConflict` promise property with `hook.getConflict()` method [8], and incoming traces now use linked-trace mode instead of mega-traces [9], [10] to keep observability readable and bounded per invocation.

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Action items

References

  1. [1] [turbo-tasks] Shrink RawVc to 8 bytes and CellId to 4 bytes ↗ vercel/next.js
  2. [2] [cli] Remove --functions-beta deploy flags and size-limit hint ↗ vercel/vercel
  3. [3] [cli] Remove --functions-beta deploy flags and size-limit hint (#16615) vercel/vercel
  4. [4] fix(test): remove deprecated public field from deployment fixtures (#16675) vercel/vercel
  5. [5] [cli] Make `vercel blob` store commands work for agents ↗ vercel/vercel
  6. [6] chore: upgrade next-rspack to rspack 2.0 ↗ vercel/next.js
  7. [7] Turbopack: add experimental React compiler support ↗ vercel/next.js
  8. [8] workflow@4.5.0 ↗ vercel/workflow
  9. [9] otel: explicit traceparent injection + linked-trace mode for bounded per-invocation traces (#2363) vercel/workflow
  10. [10] otel: explicit traceparent injection + linked-trace mode for bounded per-invocation traces ↗ vercel/workflow
  11. [11] [turbopack] Allocate `Effect`s in an arena ↗ vercel/next.js

Quick answers

What shipped in Vercel on June 16, 2026?
Next.js just cut RawVc in half and CellId by a third, removing massive chunks of peak RAM from large apps. In total, 35 commits, 36 pull requests, and 4 releases landed.
Who contributed to Vercel on June 16, 2026?
7 developers shipped this update, including lukesandberg, gscho, vvo, SyMind, wbinnssmith, karthikscale3, and sampoder.
What were the notable Vercel updates?
[turbo-tasks] Shrink RawVc to 8 bytes and CellId to 4 bytes, [cli] Remove --functions-beta deploy flags and size-limit hint, and [cli] Remove --functions-beta deploy flags and size-limit hint (#16615).

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