Not all websites implement our on-site analytics and publish the results.For these sites, we show estimated metrics based on traffic patterns across the web as a whole.
The more traffic a site gets, the more data we have to calculate estimated metrics.
Leverage browser caching for the following cacheable resources: The following text on your page renders in a way that may be difficult for some of your visitors to read. None of the above-the-fold content on your page could be rendered without waiting for the following resources to load.
Use legible font sizes to provide a better user experience. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
Certified Site Metrics are metrics that are directly-measured from the website instead of estimated.
The website owner has installed an Alexa Certify Code on the pages of their site and chosen to show the metrics publicly.