Tara on "MySQL slow queries killing my site speed"

Slowness/high CPU usage could be due to (but not limited to):
- a poor or memory intensive theme
- poor or memory intensive plugins
- your server is slow (e.g., "process hang", overload, you get a lot of visitors, other problems, etc.).
Test your site at (free online testing): http://gtmetrix.com/leverage-browser-caching.html , http://www.webpagetest.org/
Also, review these resources:
- http://www.wptavern.com/determining-which-plugins-are-slowing-your-site-down
- http://wordpress.stackexchange.com/questions/656/is-there-a-way-to-measure-server-resource-cpu-usage-by-wp-plugins/799#799
- also view this WP tv tutorial: http://wordpress.tv/2013/02/28/vinay-paudel-optimizing-and-speeding-up-a-wordpress-site/
- http://www.wptavern.com/my-performance-woes
- http://codex.wordpress.org/WordPress_Optimization
- http://codex.wordpress.org/High_Traffic_Tips_For_WordPress
- http://codex.wordpress.org/WordPress_Optimization/Caching
- http://codex.wordpress.org/WordPress_Optimization/WordPress_Performance