Measure and optimize with mod_pagespeed experiments

Mod_pagespeed, an open-source Apache module developed by the PageSpeed Team, automates web performance optimization by applying best practices such as cache extension, image optimization, and CSS inlining, thereby enhancing site speed with minimal manual input. As of version 0.10.22.4, it supports A/B testing integrated with Google Analytics, allowing users to assess its impact on live traffic and optimize configurations based on experimental data. In a month-long experiment conducted on a small, largely static blog, mod_pagespeed demonstrated a 20% reduction in average page load time, primarily by shifting a significant portion of page loads from 1-3 seconds down to 0-1 second, while also improving the performance of longer load times. This capability to measure and optimize performance seamlessly underscores its effectiveness in making the web faster, encouraging users to adopt the experiment framework for site improvement.

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