mod_deflate / mod_expires

<IfModule mod_deflate.c>
                # compress text, html, javascript, css, xml:
        AddOutputFilterByType DEFLATE text/plain
        AddOutputFilterByType DEFLATE text/html
        AddOutputFilterByType DEFLATE text/xml
        AddOutputFilterByType DEFLATE text/css
        AddOutputFilterByType DEFLATE application/xml
        AddOutputFilterByType DEFLATE application/xhtml+xml
        AddOutputFilterByType DEFLATE application/rss+xml
        AddOutputFilterByType DEFLATE application/javascript
        AddOutputFilterByType DEFLATE application/x-javascript
</IfModule>

<IfModule mod_expires.c>
        Header unset Pragma
        FileETag None
        Header unset ETag
                # Turn on Expires and set default to 0
        ExpiresActive On
        ExpiresDefault A0
                # Set up caching on media files for 1 year (forever?)
        <FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|gif|jpg|jpeg|png|swf)$">
                ExpiresDefault A29030400
                Header append Cache-Control "public"
        </FilesMatch>
                # Set up 31 days caching on commonly updated files
        <FilesMatch "\.(xml|txt|html|js|css)$">
                ExpiresDefault A2678400
                Header append Cache-Control "proxy-revalidate"
        </FilesMatch>
                # Force no caching for dynamic files
        <FilesMatch "\.(php|cgi|pl|htm)$">
                ExpiresActive Off
                Header set Cache-Control "private, no-cache, no-store, proxy-revalidate, no-transform"
                Header set Pragma "no-cache"
        </FilesMatch>
</IfModule>