Online Website Speed Analyzer: GTmetrix
The speed of a website is a very important factor for providing a better browsing experience to visitors (which directly effects the success of a website).
Specially, after Google announced that "speed" became one of the elements in its search ranking, it is clear that web designers/developers should be focusing more on this.
It enables you to compare multiple URLs and, once signed up, you can:
- view the past tests ran to compare with the current results
- schedule daily/weekly/monthly automated checks
- save reports
- set any report to be public or private
GTmetrix also has a bookmarklet which you can run a test for any website with a click.