Granted, this is a highly technical free resource that most of you will probably not know what to do with. But for those of you who do understand the information and help it provides, or are willing to slog through its detailed documentation, here it is (the rest will probably do well to bookmark it just in case).
Give it a URL, and it does a speed test. Then it spits out a bunch of highly detailed reports. With grades and ratings and graphs and data. All technical ones. And it also gives you suggestions on how to improve and optimize the parts that got poor ratings. Yeah, the advice is highly technical too.
Not much more to say, really. Oh—it does all that really quickly.