The tool analyzes any URL, gives it a grade (on a score of 0-100) and then offers a potentially long list of ways to make the page faster. The suggestions are divided into High, Medium and Low priority. The test, appropriately, runs in a matter of seconds.
Search Engine Land has scored an 85 and 84 in the two tests I ran within a couple minutes of each other. Here’s a look at the suggestions provided to us:
That’s an analysis of desktop page speed; you can select to also run a mobile speed report.
There are also page speed extensions for Firefox and Chrome, as well as other code/instructions for developers on that page.
It was just about a year ago that Google announced it was using speed as a ranking factor in its search results.