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We are constantly testing world's top websites and measuring many parameters such as page speed and mobile usability, html statistics, resource usage, and website safety. You may have heard that all these signals are now considered by Google ranking algorithms. Here is what Google said about mobile-friendly websites:
Starting April 21 2015, we will be expanding our use of mobile-friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact in our search results. Consequently, users will find it easier to get relevant, high quality search results that are optimized for their devices.
Google Webmaster Central Blog
... few words about page speed:
Speeding up websites is important — not just to site owners, but to all Internet users. Faster sites create happy users and we've seen in our internal studies that when a site responds slowly, visitors spend less time there. But faster sites don't just improve user experience; recent data shows that improving site speed also reduces operating costs. Like us, our users place a lot of value in speed — that's why we've decided to take site speed into account in our search rankings. We use a variety of sources to determine the speed of a site relative to other sites.
Google Webmaster Central Blog
We are also taking website screenshot using both mobile and desktop browsers. Check out our list of recently tested websites or use search form to get test results of your site.