apache:
<IfModule pagespeed_module>
ModPagespeed on
ModPagespeedEnableFilters inline_css
ModPagespeedEnableFilters lazyload_images
AddOutputFilterByType MOD_PAGESPEED_OUTPUT_FILTER text/html
ModPagespeedEnableFilters convert_gif_to_png
ModPagespeedEnableFilters convert_jpeg_to_progressive
ModPagespeedEnableFilters convert_jpeg_to_webp
ModPagespeedEnableFilters convert_png_to_jpeg
ModPagespeedEnableFilters convert_to_webp_lossless
ModPagespeedEnableFilters inline_images
ModPagespeedEnableFilters recompress_images
ModPagespeedEnableFilters recompress_jpeg
ModPagespeedEnableFilters recompress_png
ModPagespeedEnableFilters recompress_webp
ModPagespeedEnableFilters jpeg_subsampling
ModPagespeedEnableFilters remove_comments
ModPagespeedEnableFilters Combine_css
ModPagespeedEnableFilters rewrite_javascript,rewrite_css
ModPagespeedEnableFilters collapse_whitespace,elide_attributes
ModPagespeedFileCacheInodeLimit 500000
ModPagespeedFileCachePath "/var/cache/mod_pagespeed/"
</IfModule>