The page loading speed is crucial in determining its positioning within the SERP. To be able to reduce it, there are several things you can do.
SEO Checker allows you to single out both the elements that influence the loading of the page. Both when browsing from desktop and those when you browse from mobile.
To browse among the device performances, simply click on the corresponding tab:
For example, by selecting the desktop view, SEO Checker can tell you which files you can cache, as in this case: