Google keeps improving its tool for evaluating site load speed PageSpeed Insights:
By default, PageSpeed Insights displays a tab with a performance analysis for mobile devices. You can switch to the results for desktop if you want.
A screenshot of the load speed test results for google.com for mobile devices
SEO–expert commentary:
«It’s crucial to track your site load speed because it’s one of Google’s ranking factors. The new interface has more insights about the load speed of different parts and elements of a web page. It’s important to remember that your website must load fast both on desktop and mobile if you want to rank high in search engines».
Technologist SEO-expert of the SEO.RU Company
Konstantin Abdullin