Help Needed to Optimize Plugins

I’m developing http://www.avengerscollectibles.com/wp/about/ to raise some extra money for our single income family this holiday season and could use some advice on how to improve my plugins.

My primary concern is excessive CPU usage but I would also like to reduce the quantity of my 52 plugins while improving at least 5 with only a 3.x rating.

Any help would be greatly appreciated and I will be happy to reciprocate with any HTML5, CSS3, or other advice I am able to offer for your site as well.