As a means of creating mobile optimized websites, Front End Optimization, (FEO) targets the front end or "last mile" of web content consumption: the delivery over the wireless network and the rendering of HTML in a browser. To improve performance at the front end, FEO employs several techniques including:
Reducing the number of HTTP requests initiated by an HTML page
Reducing the number of bytes associated with a web page download, for instance by resizing and compressing images
Optimizing page rendering in the browser so that the important parts of the page display as quickly as possible without getting held up by less important parts like third party content
原文：http://17529.blog.51cto.com/7529/1682594