If you are a website developer or you are simply interested in how fast a website loads, you could try a website called Pingdom.

At Pingdom they say: “The test is designed to help make your site faster by identifying what about a webpage is fast, slow, too big, and so on. We have tried to make it useful both for experts and novices alike.
In short, we wanted it to be an easy-to-use tool built to help webmasters and web developers everywhere optimize their website performance.”