Turbocharging web sites with new PageSpeed Service optimizations- Google Developers Blog
Aug 2, 2012

Summary
Introduced new optimizations for the Page Speed Service, including the use of progressive JPEGs and improved caching techniques. These optimizations aim to further reduce latency and improve page load times by intelligently caching resources and optimizing image delivery.
More from the Website Optimization and Experimentation APIs trail
- Introducing Autotrack for analytics.js- Google Developers Blog
- IISpeed accelerates visitnapavalley.com, with PageSpeed optimization by Google- Google Developers Blog
- Crawling the infinite scroll- Google Developers Blog
- Measuring network performance with Resource Timing API- Google Developers Blog
- Speeding up mobile pages with mod_pagespeed and ngx_pagespeed- Google Developers Blog