Lighthouse is one of the most widely used tools to grade the user experience. People across the world have been using the tool to grade the site speed. However, one of the key and often neglected issues with the Lighthouse based grading, is that the score is generated for one particular sample run on a specific Chrome browser simulated on a particular mobile device and using a specific Network and Latency settings from the USA location. Clearly, that score does not represent the user experience of that page for all traffic. In fact, many people use the score generated on the homepage as the representation of the site score.
The score calculated above is based on the First Contentful Paint (FCP), Largest Contentful Paint (LCP), SpeedIndex (SI), Cumulative Layout Shift (CLS) and Total Blocking Time (TBT).
But in no way, it represents the complete picture of the site and not certainly represents the Real User Score.
In Gemini, we have managed to solve the algorithm of real user SpeedIndex and real user Total Blocking Time. Thus, we are able to calculate the Gemini score based on the Lighthouse 10 Scoring algorithm. Because we have site speed data and score for each page type and samples, we are able to generate an aggregated score for the site for the real users.
The Gemini Score is now available on our Speed Details Page, where one can see the aggregated site level and even the Company level data.
gemini score of site
We are also showing Gemini score in the Page Waterfall for each sample. This way, the developer can easily debug the performance by looking at the score.
With the Gemini Score, you can now represent the Real user Experience of the Site in a reliable way. The score gets generated automatically. No need to run them. The score is also available in the download data. We recommend shifting to real user Gemini Score for the whole Site data.