Vercel Sandbox Domain Lookups Got 18x Faster: Median 62ms Down to 3.4ms, Biggest Gains in Sydney and Cape Town

Vercel’s 2026-09-08 changelog states that requests to Vercel Sandbox public domains are now routed 18x faster. Short entry, complete numbers, and unusually relevant if you are far from the United States — which includes most of the Asia-Pacific. From the official changelog (verified 2026-09-09).

1. What changed: one central store became nearest-replica resolution

Vercel is specific: domains created with the sandbox.domain() SDK call are now resolved from the nearest regional replica, instead of a single centralized store. Incoming requests reach the process running in the sandbox with less latency.

2. The published numbers

Vercel notes the improvement is largest in regions farthest from the previous store, which is why Sydney and Cape Town look extreme. Asia-Pacific users are geographically in that same “far away” group, though Vercel published no figures for specific Asian regions — and we do not extrapolate.

3. What you have to do: nothing

The two most practical lines in the entry:

• This applies automatically to every request to a sandbox domain.
• There are no pricing changes.

No code change, no redeploy, no plan upgrade.

4. When you will actually feel it

Sandbox is an execution environment for untrusted or ephemeral code, most commonly used to run things on behalf of AI agents. So the gains land here:

1. Live previews of agent-generated apps — every preview request begins with a domain lookup, and that latency is felt directly between clicking and seeing.
2. Short-lived sandboxes — for a task that runs for a few seconds, a fixed 62ms is a meaningful share of the total; 3.4ms is a real difference.
3. Cross-region agent workflows — for example Cursor’s Cloud Agents can execute in Vercel Sandbox: Cursor Cloud Agents can run in Vercel Sandbox.

5. Our read: this is the unglamorous layer agent infrastructure needed

Attention for the past year has gone to how smart the models are, but what decides whether agents are usable is often this kind of boring plumbing: how domains resolve, how fast a sandbox starts, how quickly a preview appears. 62ms is nothing to a human, but an agent loop may make dozens of these calls.

One caveat: the figure is for domain lookup, not end-to-end request time, so your perceived improvement gets diluted by everything else in the path. No end-to-end numbers were published, and we do not extrapolate them.

Other recent Vercel pieces: Flat Rate CDN reaches GA, production deployment protection is now free, and AI Gateway: one key for many models. Tool status: v0 / Vercel profile.

Sources

• Vercel Changelog, “Vercel Sandbox routing is now 18x faster globally,” 2026-09-08: https://vercel.com/changelog/vercel-sandbox-routing-is-now-18x-faster-globally

Last verified: 2026-09-09