The Apache module PageSpeed provides various optimizations for HTML, JavaScript and such, which is great.
However, some of its features are redundant with Drupal's own aggregation and optimization methods. So has anyone tested which filters would be useful for a typical Drupal 7 website and which would be useless due to Drupal already providing support for it?
This is the PageSpeed section from my .htaccess:
<IfModule pagespeed_module>
ModPagespeed on
ModPagespeedEnableFilters extend_cache
ModPagespeedEnableFilters collapse_whitespace
ModPagespeedEnableFilters combine_css
ModPagespeedEnableFilters move_css_to_head
ModPagespeedEnableFilters remove_comments
ModPagespeedEnableFilters inline_css
ModPagespeedEnableFilters rewrite_javascript
ModPagespeedEnableFilters insert_img_dimensions
ModPagespeedEnableFilters rewrite_images
ModPagespeedEnableFilters rewrite_css
</IfModule>
Whilst there is a little overlap with the js and css compression, I'm not seeing any negative results. I've set Drupal 7 to aggregate and compress CSS and JS.
The site isn't particularly high traffic though.
Here is my htaccess setup:
# -----------------------------------------------------------------------
# Enable keep-alive for faster pagespeed:
# -----------------------------------------------------------------------
<ifModule mod_headers.c>
Header set Connection keep-alive
</ifModule>
# -----------------------------------------------------------------------
# Expire caching
# -----------------------------------------------------------------------
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access plus 1 year"
ExpiresByType image/jpeg "access plus 1 year"
ExpiresByType image/gif "access plus 1 year"
ExpiresByType image/png "access plus 1 year"
ExpiresByType text/css "access plus 1 month"
ExpiresByType application/pdf "access plus 1 month"
ExpiresByType application/x-font-woff "access plus 1 year"
ExpiresByType application/x-font-woff2 "access plus 1 year"
ExpiresByType application/x-font-ttf "access plus 1 year"
ExpiresByType text/x-javascript "access plus 1 month"
ExpiresByType application/x-shockwave-flash "access plus 1 month"
ExpiresByType image/x-icon "access plus 1 year"
ExpiresDefault "access plus 2 days"
</IfModule>
# -----------------------------------------------------------------------
# Cache Headers
# -----------------------------------------------------------------------
<ifmodule mod_headers.c>
# Cache specified files for 31 days
<filesmatch "\.(ico|flv|jpg|jpeg|png|gif|css|swf)$">
Header set Cache-Control "max-age=2678400, public"
</filesmatch>
# Cache HTML files for a couple hours
<filesmatch "\.(html|htm)$">
Header set Cache-Control "max-age=7200, private, must-revalidate"
</filesmatch>
# Cache PDFs for a day
<filesmatch "\.(pdf)$">
Header set Cache-Control "max-age=86400, public"
</filesmatch>
# Cache Javascripts for 31 days
<filesmatch "\.(js)$">
Header set Cache-Control "max-age=2678400, private"
</filesmatch>
</ifmodule>
# -----------------------------------------------------------------------
# Defining MIME types to ensure the web server actually knows about them.
# -----------------------------------------------------------------------
<IfModule mod_mime.c>
AddType text/css .css
AddType application/javascript .js
AddType application/x-javascript .js
AddType text/html .html .htm
AddType text/richtext .rtf .rtx
AddType image/svg+xml .svg .svgz
AddType text/plain .txt
AddType text/xsd .xsd
AddType text/xsl .xsl
AddType text/xml .xml
AddType video/asf .asf .asx .wax .wmv .wmx
AddType video/avi .avi
AddType image/bmp .bmp
AddType application/java .class
AddType video/divx .divx
AddType application/msword .doc .docx
AddType application/x-msdownload .exe
AddType image/gif .gif
AddType application/x-gzip .gz .gzip
AddType image/x-icon .ico
AddType image/jpeg .jpg .jpeg .jpe
AddType application/vnd.ms-access .mdb
AddType audio/midi .mid .midi
AddType video/quicktime .mov .qt
AddType audio/mpeg .mp3 .m4a
AddType video/mp4 .mp4 .m4v
AddType video/mpeg .mpeg .mpg .mpe
AddType application/vnd.ms-project .mpp
AddType application/vnd.oasis.opendocument.database .odb
AddType application/vnd.oasis.opendocument.chart .odc
AddType application/vnd.oasis.opendocument.formula .odf
AddType application/vnd.oasis.opendocument.graphics .odg
AddType application/vnd.oasis.opendocument.presentation .odp
AddType application/vnd.oasis.opendocument.spreadsheet .ods
AddType application/vnd.oasis.opendocument.text .odt
AddType audio/ogg .ogg
AddType application/pdf .pdf
AddType image/png .png
AddType application/vnd.ms-powerpoint .pot .pps .ppt .pptx
AddType audio/x-realaudio .ra .ram
AddType application/x-shockwave-flash .swf
AddType application/x-tar .tar
AddType image/tiff .tif .tiff
AddType audio/wav .wav
AddType audio/wma .wma
AddType application/vnd.ms-write .wri
AddType application/vnd.ms-excel .xla .xls .xlsx .xlt .xlw
AddType application/zip .zip
AddEncoding gzip svgz
#AddEncoding gzip js
#AddEncoding gzip css
</Ifmodule>
# -----------------------------------------------------------------------
# Compressing output.
# -----------------------------------------------------------------------
<IfModule mod_deflate.c>
# Enable compression
SetOutputFilter DEFLATE
# Don't compress images
SetEnvIfNoCase Request_URI \.(?:gif|png|jpg|jpeg)$ no-gzip dont-vary
Header append Vary User-Agent env=!dont-vary
</IfModule>
# -----------------------------------------------------------------------
# PageSpeed. - TESTED with Mediacenter
# -----------------------------------------------------------------------
<IfModule pagespeed_module>
# Turn on mod_pagespeed. To completely disable mod_pagespeed, you
# can set this to "off".
ModPagespeed on
# Direct Apache to send all HTML output to the mod_pagespeed
# output handler.
AddOutputFilterByType MOD_PAGESPEED_OUTPUT_FILTER text/html
ModPagespeedLowercaseHtmlNames on
ModPagespeedEnableFilters extend_cache
ModPagespeedEnableFilters insert_dns_prefetch
ModPagespeedEnableFilters add_head
ModPagespeedEnableFilters add_instrumentation
ModPagespeedEnableFilters make_google_analytics_async
#ModPagespeedEnableFilters make_show_ads_async
ModPagespeedEnableFilters flatten_css_imports
#
# Text / HTML
#
ModPagespeedEnableFilters collapse_whitespace
ModPagespeedEnableFilters convert_meta_tags
ModPagespeedEnableFilters remove_comments
ModPagespeedEnableFilters collapse_whitespace
ModPagespeedEnableFilters elide_attributes
ModPagespeedEnableFilters trim_urls
ModPagespeedEnableFilters pedantic
#
# JavaScript
#
ModPagespeedEnableFilters combine_javascript
#ModPagespeedEnableFilters canonicalize_javascript_libraries
ModPagespeedEnableFilters rewrite_javascript
ModPagespeedEnableFilters defer_javascript
ModPagespeedEnableFilters inline_javascript
#
# CSS
#
ModPagespeedEnableFilters rewrite_css
ModPagespeedEnableFilters combine_css
ModPagespeedEnableFilters move_css_to_head
ModPagespeedEnableFilters inline_css
ModPagespeedEnableFilters inline_import_to_link
ModPagespeedEnableFilters move_css_above_scripts
#
# Images
#
ModPagespeedEnableFilters inline_preview_images
ModPagespeedEnableFilters insert_img_dimensions
ModPagespeedEnableFilters rewrite_images
ModPagespeedEnableFilters convert_gif_to_png
ModPagespeedEnableFilters recompress_images
ModPagespeedEnableFilters recompress_jpeg
ModPagespeedEnableFilters recompress_png
ModPagespeedEnableFilters convert_jpeg_to_progressive
ModPagespeedEnableFilters resize_mobile_images
ModPagespeedEnableFilters sprite_images
ModPagespeedEnableFilters lazyload_images
ModPagespeedEnableFilters local_storage_cache
ModPagespeedJpegRecompressionQuality 100
#ModPagespeedEnableFilters responsive_images
ModPagespeedEnableFilters resize_images
# Disallow problematic files:
#ModPagespeedDisallow "*/respond.js"
#ModPagespeedDisallow "*/lightbox.js*"
</IfModule>