Increase Page Speed

I need assistance with increasing the overall page speed of my website. This will increase user experience and possibly revenue.? Using Google Webmaster tools, you can see the current crawl statistics here: [[login to view URL]][1] I blocked the entire website beginning of march. That is why the? trough is there like that. The spike in February was because all products were being returned in queries instead of the ones needed. That issue was resolved. [[login to view URL]][2]? It currently takes 5.1 seconds for documents to load on average according to the site? performance image. This was actually above 10 seconds when the green-products directory was not blocked by robots.txt. This directory will be unblocked by the end of this project.? Coders are encouraged to use Google Page Speed and YSlow for this project. Selected coders should be familiar with Combining JavaScript, Enabling Compression, Combining CSS, Minifying HTML + CSS + JavaScript, Serving Static Content from Cookieless Domains, Leverage Browsing Caching, Leverage Proxy Caching, Avoiding Bad Requests, Minimizing DNS Lookups, Minimizing Redirects, Minimizing Request Size, Optimizing Images, Optimizing Order of Styles + Scripts, ? Serving Static Resources from a Consistent URL, Serving Scaled Images, etc. More Information in Advanced Description.