Interesting tool for performance testing. But there's a big difference in results between tools.pingdom.com , gtmetrix.com, and this tool.

My results in this tool are a lot worse than compared tools.pingdom and gtmetrix.

Total load time for ChrisLema.com here is 0,2..sec while in gtmetrix it is 2.8sec and 2.09 in tools.pingdom

With my site it is more consistent, I had an F here with 1.6sec, but 0,6sec on tools.pingdom and 1.6sec via gtmetrix (normally that's around 1.2sec).

So I wonder how these measurements are made and how reliable they are.