The upgrade consists of two changes:
1. Upgrade to new version of Google Lighthouse
Acquia Optimize has upgraded to a new performance weight system with Google Lighthouse version 8.5. Google Lighthouse is the tool that delivers data to the Performance module. In version 8.5, new metrics are added while others are 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 following metrics are removed:
The following metrics are added:
Some of these scores are not visible in the report but are calculated into the score in the background.
The History Center displays an indication that the version has changed, to help users understand why the Performance score shows a sudden jump.
For more information on how the scores are calculated after the upgrade, see:
2. Excluding archived profiles from the Average Performance score
In the History Center, we display an Average Performance score which is calculated as the average of all the Performance Scores of your pages. For example, if you are running performance scans on six pages, the Average Performance score is the average score of those six.
Before, this score also factored in profiles on performance pages that are archived. Now, archived profiles are disregarded from the Average Performance score calculation. This makes the score more accurate. This only affects your score if you have archived Performance profiles on your account.
How the Performance score is weighted:
The Performance score is a weighted average of the metric scores. Naturally, more heavily weighted metrics have a greater effect on your overall performance score.
The metric scores are not visible in the report but are calculated in the background.
The weightings are chosen to provide a balanced representation of the user's perception of performance.
Explore scoring with the Lighthouse scoring calculator
| Audit | Weight |
| First Contentful Paint | 10% |
| Speed Index | 10% |
| Largest Contentful Paint | 25% |
| Time to Interactive | 10% |
| Total Blocking Time | 30% |
| Cumulative Layout Shift | 15% |
When the performance metrics are gathered, (mostly reported in milliseconds), Lighthouse converts each raw metric value into a metric score from 0 to 100 by looking where the metric value falls on its Lighthouse scoring distribution.
The IP addresses used for the Performance Module are:
EU: 35.205.195.161
US: 35.192.89.240
AU: 35.244.113.9
Asia: 34.126.69.123.
See the following articles for more information:
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Wed Oct 23 2024 18:15:51 GMT+0000 (Coordinated Universal Time)