mod_pagespeed version 18.104.22.168 release to the beta channel with added support for memcached that "reduces server load time and improved utilization for large, multi-server environments."
Google notes, wth memcached, "multiple Apache servers share and fetch the same resources optimized by mod_pagespeed."
In addition, "logging and reporting have been improved to make it easier to keep track of resource consumption and optimization effectiveness across multiple sites hosted by a single Apache installation."
These new features make mod_pagespeed even better for high-traffic sites and network providers hosting many individual websites on their infrastructure.
Also added a number of other new features and optimizations including:
- "Improved CSS optimization. CSS media queries are now supported, and the new fallback_rewrite_css_urls filter allows partial optimization of CSS containing unsupported or proprietary extensions.
- The default set of optimizers now includes the flatten_css_imports filter, improving out-of-the-box performance.
- Improved mod_spdy interaction with support for custom mod_pagespeed configuration and filters for SPDY enabled clients. This makes it easier to deploy SPDY on your site, which can significantly decrease page load times," informs Google.