You can enter a web address to measure the speed of the web server.
The four different values mean:

1. Redirect: If the requested website forwards the browser to another website, e. g. google.com forwards to www.google.com.
2. DNS-Lookup: Every domain name has an IP address (like a phone number). More information on wikipedia.
3. Connect: Time to connect to the webs server.
4. Wait for Server: Time until the server sends a response to our request.
5. Transfer Data: Download time for the website's HTML part (Doesn't include images, stylesheets or scripts).