---
title: quic.rtt.variance
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/quic-rtt-variance
---

**Type:** INTEGER  
**Access:** read-only

**Available in:** recv, hash, deliver, log

Variance observed in the round-trip time samples observed by the server.
This is computed as described in [draft-ietf-quic-recovery](https://tools.ietf.org/html/draft-ietf-quic-recovery).