Webpagetest is one of the most popular and free tools for measuring webpage performance.
Webpagetest enables you to run web performance tests on your site from a number of different locations across the world in a number of different browsers.
Wevpagetest gives you values for following parameters of your webpage
- Load Time – Time requires to load the page
- First Byte Time – Time when your request started to execute
- Page Size – Total Size for your Web page
- Requests – Number of Requests your Webpage made.