mod_pagespeed v1.2 'Cache advances, Progressive JPEGs' 2012 YouTube Top Trailers Leaderboard

mod_pagespeed now at version 1.2 comes with two new features added to improve the caching experience for users coming to a site for the first time: "canonicalize_javascript_libraries and insert_dns_prefetch.""The new "canonicalize_javascript_libraries" filter in mod_pagespeed finds such libraries on your site and replaces them with links to the equivalent libraries on ajax.googleapis.com. With the optimization, a […]

mod_pagespeed now at version 1.2 comes with two new features added to improve the caching experience for users coming to a site for the first time: "canonicalize_javascript_libraries and insert_dns_prefetch."

mod_pagespeed v1.2 cache advances, progressive JPEGs

"The new "canonicalize_javascript_libraries" filter in mod_pagespeed finds such libraries on your site and replaces them with links to the equivalent libraries on ajax.googleapis.com. With the optimization, a browser will notice that your site is requesting the library from the same shared library provider as a previous site it visited, and will use the copy in its cache," explains Google.

While, ""insert_dns_prefetch" filter inserts <link rel="dns-prefetch"> tags to allow the browser to pre-resolve DNS for resources on the page," google added.

In addition, mod_pagespeed 1.2 can proxy and optimize resources from trusted domains. "This feature enables you to optimize resources even from servers that don't run mod_pagespeed. Beyond compressing and cache-extending such resources, this can improve performance of sites running SPDY where the best practices for performance are to serve all resources from the same domain (see mod_spdy)," google adds.

Additionally, convert_jpeg_to_progressive is now a 'core' filter." "Large JPEG images are now transcoded to progressive." Both of these improves the browser experience and makes such files smaller.

For more details, check out the release notes and mod_pagespeed download page.