I would like to do a/b testing for my website, but I don't want to use javascript based solution such as google weboptimizer because it would affect page load times. Are there any server side frameworks to assist in a/b testing? I can always write conditional code for creating scenarios as a quick fix, but I am not sure how to measure the variance in google analytics. So, is there a/b testing tool which is server based and integrates with google analytics?
Update: I am using java as server side language along with jsf, deployed in jboss.