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

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

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

An average of the round-trip time samples, in milliseconds, observed by the server.
This is an exponentially-weighted moving average of the round-trip
time samples, computed as described in [draft-ietf-quic-recovery](https://tools.ietf.org/html/draft-ietf-quic-recovery).