---
agentTools:
  projectIndex: https://support.speedcurve.com/llms.txt
---

# Synthetic: CLS windows

![](https://files.readme.io/bddc878-Screenshot_2023-06-27_at_9.29.24_AM.png)

**27th June 2023 (UTC)**

We've added a new chart to the Synthetic Vitals and Test dashboards that shows all layout shifts – including which shifts within a 5s session window contribute to CLS.

[Learn more](https://web.dev/evolving-cls/) about the changes to CLS and how the 5s session window works.