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
• Lighthouse scoring calculator

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

• Scoring changes explanation from Google

See the following articles for more information:

• Performance User Guide
• Performance Update with new Google Web Vitals.