---
title: "Performance module upgrade to Lighthouse 10"
date: "2023-08-28T10:55:17+00:00"
summary: "Discover how Acquia Optimize's upgrade to Lighthouse 10 affects your Performance score and learn about the new metric weightings."
image:
type: "announcement"
url: "/web-governance/announcement/2023-08-28/74011-performance-module-upgrade-lighthouse-10"
id: "da5995c8-aeba-463e-a346-d310bb093e3c"
---

Acquia Optimize has upgraded to a new performance weight system with Google Lighthouse version 10. Google Lighthouse is the tool that delivers data to the Performance module.

In Lighthouse version 10, the metric **Time To Interactive (TTI) is removed**. At the same time, the weighting of the different metrics in the calculation of the overall score is changing. For those reasons, **you are likely to see a change in your Performance Score as a result of the upgrade**.

The History Center displays an indication that the version has changed, to help users understand why the Performance score may show a sudden jump.

For more information on how the scores are calculated after the upgrade, see:

*   [Lighthouse performance scoring](https://web.dev/performance-scoring/#weightings)
*   [Lighthouse scoring calculator](https://googlechrome.github.io/lighthouse/scorecalc/)

For more information about the reasons behind the removal of the TTI metric, see:

*   [Scoring changes explanation from Google](https://googlechrome.github.io/lighthouse/scorecalc/)

See the following articles for more information:

*   [Performance User Guide](/en/articles/5703632-performance)
*   [Performance Update with new Google Web Vitals](/en/articles/5789381-performance-update-with-new-google-s-web-vitals).