I'm working on my site , and struggle how to improve my speedpage test. From their suggestion you would need to avoid your CSS and Java script blocking the render of your site. And i know doin hunting on it one by one is pain in the ass not to mention the time you'd waste. Thanks Lord I found this plugin. How sorry this nice plugin doesn't downloaded too much, even worse I'm the first to vote for it.
1. I've improved my site score by 15 points using this plugin only.
2. to check you pagespeed you can go to: http://developers.google.com/speed/pagespeed/insights/?url (simply paste ur url in the box provided)
conclusion : this plugin deserve 5 stars rating