Good article analyzing some of the tools for assessing the speed of a WordPress (or any) site.
How long does it take for your WordPress website to load? Two seconds? Three seconds? Heaven forbid, more than four seconds? If you don’t know, there’s a good chance that a slow-loading website is costing you pageviews and conversions. The first step to fixing any problem is admitting that you have a problem. But how do find out if you even have a website speed problem? By using free website speed testing tools.