Does not only tell you a ranking and a the time a page takes to load, but a super clear breakdown of each element, its timing and size and potential issues or errors.
A must for any website tuning and became an industry standard.
Registering is not required for single test, while free registration gives you the ability to automatically monitor a page, and upgrtading to a paid version gives more options such as location choice, browser choice or more pages to follow.
Free, No registration