http://www.sitepoint.com/speed-wordpress/
http://www.sparringmind.com/speed-up-wordpress/
http://www.htmlgoodies.com/beyond/cms/10-ways-to-speed-up-your-wordpress-sites.html
Running Your Own Website Speed Test
Before making any changes to your site, it is a good idea to run a page speed test, to establish a baseline. There is plenty of speed testing tools available, ranging from web services to browser extensions. The most popular tools include:
All of these tools have similar features and give you both measurements and scores, as well as a list of suggested areas for improvement. PageSpeed Insights also gives you mobile statistics.