Nginx module by Google for rewriting web pages to reduce latency and bandwidth

Nginx module created by Google to help Make the Web Faster by rewriting web pages to reduce latency and bandwidth. It started as a port of mod_pagespeed to Nginx, and for now the documentation links below still all point to mod_pagespeed's documentation.

Here are some of the most useful PageSpeed filters. Each one has a simple HTML example attached; click "before" to see the original file, and "after" to see what PageSpeed produces with that filter (and only that filter) enabled. The two versions should look exactly the same, but the "after" one will be (slightly) speedier. Use "view source" to see the PageSpeed difference!

add_instrumentationAdds client-side latency instrumentation.before after canonicalize_javascript_librariesRecognizes common JavaScript libraries and redirects each to a canonical URL.before after collapse_whitespaceRemoves unnecessary whitespace in HTML.before after combine_cssCombines multiple CSS files into one.before after combine_headsCombines multiple <head> elements into one.before after combine_javascriptCombines multiple JavaScript files into one.before after defer_javascriptDefers the execution of javascript in the HTML.before after elide_attributesRemoves unnecessary attributes in HTML tags.before after pedanticAdds default type attributes to script and style tags that are missing them.before after extend_cacheImproves cacheability.before after extend_cache_pdfsImproves cacheability of PDFs.before after fallback_rewrite_css_urlsRewrite URLs in CSS even if CSS is not parseable.before after flatten_css_importsFlattens @import rules in CSS by replacing the rule with the contents of the imported resource.before after inline_cssInlines small external CSS files.before after inline_import_to_linkInlines style tags comprising only CSS @imports by converting them to an equivalent link.before after inline_javascriptInlines small external Javascript files.before after inline_preview_imagesDelays original images; serves inlined, low-quality placeholder images until originals are loaded.before after insert_dns_prefetchInjects <link rel="dns-prefetch" href="http://redirect.viglink.com?key=11fe087258b6fc0532a5ccfc924805c0&u=%2F%2Fwww.example.com"> tags in the HEAD to enable the browser to do DNS prefetching.before after insert_gaInserts Google Analytics javascript snippet.before after lazyload_imagesLoads images when they become visible in the client viewport.before after local_storage_cacheLoads inlined CSS and image resources into HTML5 local storage whence the client fetches them subsequently rather than the server sending them again.before after make_google_analytics_asyncConverts synchronous Google Analytics code to load asynchronously.before after move_css_above_scriptsMoves CSS Above Scripts.before after move_css_to_headMoves CSS into the <head> element.before after outline_cssMoves large inline <style> tags into external files for cacheability.before after outline_javascriptMoves large inline <script> tags into external files for cacheability.before after prioritize_critical_cssInstruments the page, inlines its critical CSS at the top, and lazily loads the rest.before after MapProxyDomainProxies/optimizes trusted resources from domains not running PageSpeed.before after remove_commentsRemoves HTML comments.before after remove_quotesRemoves unnecessary quotes in HTML tags.before after resize_mobile_imagesJust like inline_preview_images, but uses smaller placeholder images for mobile browsers.before after rewrite_cssMinifies CSS.before afterrewrite_css + extend_cacheCache extends images in CSS.before afterrewrite_css + rewrite_imagesRe-compress images in CSS.before after rewrite_imagesRescales, and compresses images; inlines small ones.before after rewrite_javascriptMinifies Javascript.before after rewrite_style_attributesRewrite the CSS in style attributes by applying the configured rewrite_css filter to it.before after rewrite_style_attributes_with_urlRewrite the CSS in style attributes by applying the configured rewrite_css filter to it, but only if the attribute contains the text 'url('.before after sprite_imagesSprites images.before after trim_urlsRemoves unnecessary prefixes from URLs.before after

Nginx module by Google for rewriting web pages to reduce latency and bandwidth

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