Every scan runs all of them. Pick one to see the question it answers.
Such as a slow server, content that appears late and a page that jumps as it loads.
Such as images larger than they need to be and a main image that isn't loaded first.
Such as heavy scripts, unused code and outside services that slow the page.
Such as heavy pages, pages sent without compression and files browsers don't keep.
NetNav runs Google's own speed test at phone size, and adds speed data from real visitors. Then it breaks down what the page is made of, so you can see where the weight is.
Each speed task names the file, the page and the fix, with a screenshot of the slow part and steps written for your platform.
From Google's own speed test, PageSpeed, plus speed data from real visitors.
You are probably on fast wifi, with the site already saved on your device. NetNav tests at phone size, the way a first-time visitor arrives.
Speed fixes come as steps for your platform, with the files named and a screenshot of the slow part.
Your next scan measures the page again and confirms the fix.