Vercel Sandbox routing is now 18x faster globally

Vercel Sandbox domains previously relied on a single centralized store for domain resolution, which introduced latency for users in regions distant from that store. The shift to regional replicas means requests are now routed to the nearest replica, reducing the time required for domain lookups. This change is particularly impactful for edge regions like Sydney and Cape Town, where latency improvements reach up to 146x at the 99th percentile.

The latency reduction is achieved without any action required from developers or operators. Since the change is automatic and applies to all existing and new sandbox domains, it eliminates the need for manual configuration or updates. This makes the improvement immediately accessible to all users, regardless of their deployment scale or location.

While the performance gains are significant, the change is limited to domain resolution latency. It does not affect other aspects of request processing, such as compute time or data transfer speeds. Additionally, the improvement is specific to sandbox domains created via the `sandbox.domain()` SDK call, so other domain types or routing configurations remain unaffected.

The lack of pricing changes ensures that users do not incur additional costs for the performance upgrade. However, the reliance on regional replicas introduces a dependency on the availability and performance of those replicas. If a regional replica experiences downtime or degradation, domain resolution in that region could be impacted until the issue is resolved.