PageSpeed Insights

Starting our list with a free service that not only analyzes the content of a web page, but also generates suggestions to make that page faster. PageSpeed Insights is a web page test too that offers load testing services along with other important functions. There are multiple metrics which are defined into different categories, such as Field Data, Origin Summary, Diagnostics and Passed Audits, plus much more. PageSpeed utilizes real-world data to assess a website. It notifies you if there's any particular area which needs improvement.