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News · Vercel · 2 min read

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Vercel speeds up Sandbox snapshots, build disks and Workflow SDK

Vercel's November 9, 2026 changelog brings up to 10x faster Sandbox snapshots, doubled build disk space, WebSocket-based Workflow SDK writes and a bigger Container Registry layer limit.

On November 9, 2026, Vercel published four infrastructure upgrades on its changelog, covering sandboxes, builds and durable workflows that power AI coding agents and CI pipelines, starting with Vercel's changelog post on faster Sandbox snapshots.

What changed

  • Sandbox snapshot creation fell from 4.4 seconds to under 0.4 seconds (up to 10x faster), using a new Vercel Hive Snapshot (VHS) indexing format with more parallel reads and writes.
  • Snapshot restore speed improved about 50%, from 500 milliseconds to 250 milliseconds at the 50th percentile.
  • Persistent sandboxes now auto capture a snapshot on session end and resume from the latest snapshot, with no configuration required.
  • Build disk space on Basic and Standard build machines doubled from 32GB to 64GB, matching the Enhanced and Turbo tiers, applied automatically at no extra cost, per Vercel's changelog entry on build disk space.
  • The Workflow SDK now writes events and streams over WebSockets by default instead of one HTTP request per write, requiring workflow@5.2.0 or later; streams arrived 4.2 times faster than the prior v4.8.12 release, per Vercel's changelog entry on the Workflow SDK update.
  • Vercel Container Registry raised its per layer compressed image size limit from 500MB to 2GB; images are managed via the vercel vcr CLI (Vercel CLI v58.3.0 or later) and can be shared publicly or with up to 100 teams, per Vercel's changelog entry on Container Registry limits.

What it means for builders

Faster sandbox snapshots and doubled build disk space cut cold start latency and build failures for AI coding agents and CI pipelines that spin up ephemeral sandboxes on Vercel. The WebSocket-based Workflow SDK speeds up durable, agentic workflow apps, and the larger container image limit lets teams package heavier toolchains for sandboxed agent execution.

Availability and upgrade requirements

All four changes were published on Vercel's public changelog dated November 9, 2026. The snapshot and build disk improvements apply automatically, while faster Workflow SDK writes require workflow@5.2.0 or later and managing Container Registry images needs Vercel CLI v58.3.0 or later; the total image size cap stays at 15GB.

Sources

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.

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