Configurar Deflate no Apache

    Deflate serve para comprimir os dados enviados do servidor para o browser diminuindo assim a banda necessária e utilizada para o envio dos dados.

Exemplo: mod_deflate.conf
<ifmodule mod_deflate.c>
# Insert filter for all content - be carefull
SetOutputFilter DEFLATE

# Skip some browsers problems
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

# Don't compress images and other files
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|zip)$ no-gzip dont-vary

# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary

# Set log of deflate
DeflateFilterNote ratio
LogFormat '"%r" %b (%{ratio}n) "%{User-agent}i"' deflate
CustomLog /var/log/www/deflate_log deflate
</ifmodule>

Fonte:
Deflate: http://httpd.apache.org/docs/2.2/mod/mod_deflate.html