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mod_pagepseed full config with comments
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<IfModule pagespeed_module> | |
ModPagespeed On | |
ModPagespeedRewriteLevel PassThrough | |
#ModPagespeedEnableFilters convert_jpeg_to_webp,convert_jpeg_to_progressive | |
# The 'Add Instrumentation' filter injects two small blocks of JavaScript into every HTML page. These blocks measure the time the client spends | |
# loading and rendering the page, and report that measurement back to the server. | |
# LOW RISK | |
ModPagespeedEnableFilters add_instrumentation | |
# The filter rewrites pages that load the Google Analytics tracking code synchronously to load it asynchronously instead. Loading Google Analytics | |
# asynchronously has the advantage that it will not block resources that load later in the page. | |
# LOW RISK | |
ModPagespeedEnableFilters make_google_analytics_async | |
# Uses CDN libraries if found a match | |
# LOW RISK | |
ModPagespeedEnableFilters canonicalize_javascript_libraries | |
# Trims whitespace in HTML | |
# LOW RISK | |
ModPagespeedEnableFilters collapse_whitespace | |
# Reduces CSS requests | |
# LOW RISK | |
ModPagespeedEnableFilters combine_css | |
# Combines JS | |
# LOW RISK | |
ModPagespeedEnableFilters combine_javascript | |
# defer_javascript tries to defer JavaScript execution until page load. It defers this by changing the type and src attributes of <script> elements | |
# on the HTML page to pagespeed_orig_type and pagespeed_orig_src respectively. It also adds a new type attribute whose value is set to text/psajs. A | |
# window.onload handler is added to the HTML, which executes all the deferred scripts. | |
# HIGH RISK | |
# ModPagespeedEnableFilters defer_javascript | |
# The 'Elide Attributes' filter reduces the transfer size of HTML files by removing attributes from tags when the specified value is equal to the | |
# default value for that attribute. | |
# LOW RISK | |
ModPagespeedEnableFilters elide_attributes | |
# 'Extend Cache' seeks to improve the cacheability of a web page's resources without compromising the ability of site owners to change the resources | |
# and have those changes propagate to users' browsers. | |
# LOW RISK | |
ModPagespeedEnableFilters extend_cache | |
# Reduce the number of HTTP round-trips by combining multiple CSS resources into one. | |
# LOW RISK | |
ModPagespeedEnableFilters flatten_css_imports | |
# The "Inline @import to Link" filter converts a <style> tag consisting of only @import statements into the corresponding <link> tags. | |
# LOW RISK | |
ModPagespeedEnableFilters inline_import_to_link | |
# The contents of small external CSS resources are written directly into the HTML document; therefore the browser does not request those CSS | |
# resources independently. | |
# LOW RISK | |
ModPagespeedEnableFilters inline_css | |
# The "Inline JavaScript" filter reduces the number of requests made by a web page by inserting the contents of small external JavaScript resources | |
# directly into the HTML document. | |
# LOW TO MODERATE RISK | |
ModPagespeedEnableFilters inline_javascript | |
# Generates low quality versions of the images that are inlined in the HTML page. Users experience faster rendering of the page and the low quality | |
# images are replaced by high quality versions after an onload event is triggered. The filter works on images found in <img> tags. | |
# MODERATE RISK | |
ModPagespeedEnableFilters resize_mobile_images | |
# The lazyload_images filter defers loading of images until they are visible in the client's viewport. | |
# RISK: CPU cycles to calculate viewport | |
ModPagespeedEnableFilters lazyload_images | |
# This filter saves inlined resources to the browser's local storage (an HTML5 feature) on the first view of a page, and loads them from local | |
# storage on subsequent views rather than sending them (inline) again. | |
# MODERATE TO HIGH RISK, WONT SPEEDUP FIRST VIEWS | |
ModPagespeedEnableFilters local_storage_cache | |
# This filter minifies JavaScript code, using an algorithm similar to that in Douglas Crockford's popular JSMin program. At present, the filter | |
# strips all comments and most whitespace. The filter works only on JavaScript found in <script> blocks (either as the target of the src attribute, # or within the body of the block). | |
# LOW TO MODERATE RISK | |
ModPagespeedEnableFilters rewrite_javascript | |
#'Move CSS Above Scripts' seeks to make sure scripts do not block the loading of CSS resources. | |
# LOW RISK | |
ModPagespeedEnableFilters move_css_above_scripts | |
# 'Move CSS to head' seeks to reduce the number of times the browser must re-flow the document by ensuring that the CSS styles are all parsed in the | |
# head, before any body elements are introduced. | |
# LOW RISK | |
ModPagespeedEnableFilters move_css_to_head | |
# Enabling convert_to_webp_lossless causes the image optimizer to attempt to create lossless webp images whenever it encounters gifs or pngs. The | |
# lossless webp images are only served to modern browsers that support the format (libwebp version 0.2.0 and above). | |
# LOW RISK | |
ModPagespeedEnableFilters convert_to_webp_lossless | |
# This flag inserts width= and height= attributes into <img> tags that lack them and sets them to the image's width and height. Note that this can | |
# cause image stretching or shrinking if CSS rules specify only one image dimension | |
# HIGH RISK | |
ModPagespeedEnableFilters insert_image_dimensions | |
# This is equivalent to enabling inline_images, recompress_images, convert_png_to_jpeg, and resize_images. | |
# In every case, the image on the page is replaced by the optimized version only if the optimized version is actually smaller than the original. | |
# MODERATE RISK, CPU cycles to resize or recompress | |
ModPagespeedEnableFilters rewrite_images | |
# Moves small JS to external resources | |
# MAY NOT IMPROVE PERF AT ALL DEPENDING ON THE SITE | |
ModPagespeedEnableFilters outline_javascript | |
# DNS resolution time varies from <1ms for locally cached results, to hundreds of milliseconds due to the cascading nature of DNS. This can | |
# contribute significantly towards total page load time. This filter reduces DNS lookup time by providing hints to the browser at the beginning of | |
# the HTML, which allows the browser to pre-resolve DNS for resources on the page. | |
# LOW RISK | |
ModPagespeedEnableFilters insert_dns_prefetch | |
# prioritize_critical_css parses the CSS and replaces it with inlined CSS that contains only the rules used on the page. This avoids any blocking | |
# CSS requests needed for the initial render. It also collects all CSS tags and appends them to the HTML in the same order they were found. This | |
# will make all style rules available after page load. | |
# MODERATE RISK | |
ModPagespeedEnableFilters prioritize_critical_css | |
# Removes comments from HTML | |
# MODERATE RISK | |
ModPagespeedEnableFilters remove_comments | |
# This filter parses linked and inline CSS, rewrites the images found and minifies the CSS. The filter works on CSS found in <style> blocks and < | |
# link> refs. | |
# MODERATE RISK | |
ModPagespeedEnableFilters rewrite_css | |
# The "Rewrite Style Attributes" filter rewrites the CSS inside elements' style attributes as performed by rewrite_css, which includes CSS | |
# minification, image rewriting, image recompression, and cache extension, if enabled. | |
# LOW RISK | |
ModPagespeedEnableFilters rewrite_style_attributes | |
</IfModule> |
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