By Jeff Kaufman, Software Engineer, PageSpeed Team cache extension , image optimization , and css inlining to speed up your site without a lot of hassle. As of version 0.10.22.4, mod_pagespeed now supports A/B tests integrated with Google Analytics , allowing you to measure how much it speeds up your site on live traffic and experimentally determine the best settings.custom variable . Within Analytics you can track the impact of experimental configurations on page load times, bounce rates, conversions, or any other Analytics metric.pagespeed.conf:ModPagespeedRunExperiment on
ModPagespeedAnalyticsID "UA-XXXXXXXX-Y"
# half the users get the pagespeed optimizations
ModPagespeedExperimentSpec id=3;percent=50;default
# half get an unoptimized site
ModPagespeedExperimentSpec id=4;percent=50
While this site was static and contained mostly text, it did use some JavaScript and images and had not been manually optimized. We ran the experiment for a month, over which Analytics observed 11K page views, and we saw a 20% improvement in average page load time:experiment framework guide and start measuring the effect mod_pagespeed has on your site.Jeff Kaufman works on mod_pagespeed , an open-source Apache module that helps make the web faster , and is interested in experiment measurement. He also plays for contra dances , organizes other dances , and blogs about dancing , giving , and tech .Posted by Scott Knaster , Editor
