# Vercel — Serverless servers: Efficient serverless Node.js with in-function concurrency

- Company: Vercel (vercel.com)
- Announced: 2024-10-03T13:00:00+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://vercel.com/blog/serverless-servers-node-js-with-in-function-concurrency
- Record: https://forck.live/items/20943-serverless-servers-efficient-serverless-node-js-with-in-function-concurrency
- Subject: v0 / AI SDK / AI Gateway

Vercel announced a new version of Vercel Functions with in-function concurrency, now in public beta. The feature allows a single function instance to handle multiple calls simultaneously, leveraging idle time to reduce compute usage and costs by 20-50% without latency impact, based on testing with private beta customers. The runtime has been rewritten in Rust to support this architecture.

## Evidence

Verbatim from https://vercel.com/blog/serverless-servers-node-js-with-in-function-concurrency:

> We’ve been testing this new version with customers and are seeing a 20%-50% reduction in compute usage and respective cost reduction without latency impact.

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Record: https://forck.live/items/20943-serverless-servers-efficient-serverless-node-js-with-in-function-concurrency
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