5.04 - File compression

1 - Findings & Impacts

Compressing your files can reduce their weight by up to 70%. Two options to compress your files: GZIP or DEFLATE.

DEFLATE algorithm uses both LZ77 and Huffman coding (zlib)
GZIP, an evolution of Deflate, a little more powerful, better supported, more popular

==> Make sure that your server enables gzipping css & js files

2 - Recommendations

DEFLATE

For an Apache server copy / paste into your .htaccess file the following lines to enable DEFLATE compression.

AddOutputFilterByType DEFLATE text / plainAddOutputFilterByType DEFLATE text / htmlAddOutputFilterByType DEFLATE text / xmlAddOutputFilterByType DEFLATE text / cssAddOutputFilterByType DEFLATE application / xmlAddOutputFilterByType DEFLATE application / xhtml + xmlAddOutputFilterByType DEFLATE application / rss + xmlAddOutputFilterByType DEFLATE application / javascriptAddOutputFilterByType DEFLATE application / x-javascript
<files * .html>SetOutputFilter DEFLATE</ Files>

More information at https://httpd.apache.org/docs/trunk/en/mod/mod_deflate.html

GZIP

For an Apache server copy / paste into your .htaccess file the following lines to enable GZIP compression. Your server must be configured to allow GZIP compression via the mod_gzip

mod_gzip_dechunk Yesmod_gzip_item_include file \. (html? | txt | css | js | php) $mod_gzip_item_include handler ^ cgi-script $mod_gzip_item_include mime ^ text /.*mod_gzip_item_include mime ^ application / x-javascript. *mod_gzip_item_exclude mime ^ image /.*mod_gzip_item_exclude rspheader ^ Content-Encoding:. * gzip. *

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