The Pingdom Speed Test Tool will give you some quick information about the speed of your site. This doesn’t just relate to server speed, it will give you a lot of useful and actionable information like the site loading time, loading time of each element, element sizes and the total number of elements. But if you want Pingdom to continuously monitor your website’s uptime, speed, and performance they offer monthly plans starting at $10/month.
GTmetrix is a another tool that analyzes your WordPress website speed performance and offers feedback on how to improve your website performance. It combines two of the most popular Firefox performance add-ons – Yslow and Google Page Speed.
If you signup for a free account you will be able to monitor the history of your reports for up to 5 websites. Paid plans are available starting a $15/month and include the ability to track more URLs, hourly monitoring, PDF reports, and more.
WebPagetest is a free online tool that displays the load time of your web page as well as 6 different performance grades. One cool feature of WebPagetest is the ability to select the country from which to run your test. This can be used to track how your speeds vary across the world.