Per impostare la compressione Zlip su aruba basta impostare nell'.htaccess queste istruzioni
SetOutputFilter DEFLATE
AddOutputFilter DEFLATE text/plain
AddOutputFilter DEFLATE text/xml
AddOutputFilter DEFLATE application/xhtml+xml
AddOutputFilter DEFLATE text/css
AddOutputFilter DEFLATE application/xml
AddOutputFilter DEFLATE image/svg+xml
AddOutputFilter DEFLATE application/rss+xml
AddOutputFilter DEFLATE application/atom_xml
AddOutputFilter DEFLATE application/x-javascript
AddOutputFilter DEFLATE application/x-httpd-php
AddOutputFilter DEFLATE application/x-httpd-fastphp
AddOutputFilter DEFLATE application/x-httpd-eruby
AddOutputFilter DEFLATE text/html
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.(?:exe|t?gz|zip|bz2|sit|rar)$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.pdf$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.avi$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.mov$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.mp3$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.mp4$ no-gzip dont-vary
SetEnvIfNoCase Request_URI \.rm$ no-gzip dont-vary
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
fonte http://www.giorgiotave.it/forum/wordpress/126495-compressione-gzip.html
