The most useful feature is the speed optimization of pages, it can be done very easily. I think the interface could have more colors and icons. It's not so easy to use for someone who has never used this tool before. However, if you know how to use it, then it's really helpful. Also, I like the fact that you get the results in real time. There are several things that I liked about this tool. First, it gives me an idea of what needs to be improved. Second, it helps me improve the page load time. Third, it is easy to use. Fourth, I like the fact that it integrates well with CI/CD.