If you want to check the quality of a website, you can use Google Lighthouse, a free tool provided by Google. The Google Lighthouse Score is the result of this test, which is divided into five categories: Performance, Progressive Web App, Accessibility, Best Practices and SEO.
For each individual page, scores can be determined in these five categories, with separate scores being measured for desktop and mobile devices, which can lead to different results between devices.
For us, the focus is on the Lighthouse performance score, since this is significantly influenced by the theme of the Magento store and is particularly important. This is because both the user experience and the assessment of a page by search engines depend in part on the performance. Poor performance can affect the ranking in the search results of Google and other search engines.