Si tu server es decente te aconsejo activar el KeepAlive. Mira estas dos imágenes, las acabo de tomar..la primera con el KeepAlive desactivado, la segunda lo tiene activado.
Desactivado
Activado
Te pongo un ejemplo completo de htaccess:
Código Apache:
Ver originalRewriteCond %{HTTP_USER_AGENT} libwww-perl.*
RewriteRule .* – [F,L]
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?$1
</IfModule>
RewriteCond %{HTTP_HOST} ^(IPdelServer(.+)$)
RewriteRule ^(.*)$ http://www.tuweb.es/$1 [R=301,L]
<ifModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/html text/xml text/css text/plain
AddOutputFilterByType DEFLATE image/svg+xml application/xhtml+xml application/xml
AddOutputFilterByType DEFLATE application/rdf+xml application/rss+xml application/atom+xml
AddOutputFilterByType DEFLATE text/javascript application/javascript application/x-javascript application/json
AddOutputFilterByType DEFLATE application/x-font-ttf application/x-font-otf
AddOutputFilterByType DEFLATE font/truetype font/opentype
</ifModule>
<ifModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 300 seconds"
ExpiresByType text/html "access plus 600 seconds"
ExpiresByType image/gif "access plus 604800 seconds"
ExpiresByType image/ico "access plus 604800 seconds"
ExpiresByType image/jpeg "access plus 604800 seconds"
ExpiresByType image/jpg "access plus 604800 seconds"
ExpiresByType image/png "access plus 604800 seconds"
ExpiresByType text/css "access plus 604800 seconds"
ExpiresByType text/javascript "access plus 604800 seconds"
ExpiresByType application/x-javascript "access plus 604800 seconds"
ExpiresByType application/javascript "access plus 604800 seconds"
ExpiresByType application/xhtml+xml "access plus 600 seconds"
</ifModule>
Header set Connection keep-alive
<ifModule mod_headers.c>
<filesMatch "\\.(ico|pdf|flv|jpg|jpeg|png|gif|svg|swf)$">
Header set Cache-Control "max-age=2592000, public"
</filesMatch>
<filesMatch "\\.(css)$">
Header set Cache-Control "max-age=604800, public"
</filesMatch>
<filesMatch "\\.(js)$">
Header set Cache-Control "max-age=604800, private"
</filesMatch>
<filesMatch "\\.(xml|txt)$">
Header set Cache-Control "max-age=604800, public, must-revalidate"
</filesMatch>
<filesMatch "\\.(html|htm|php)$">
Header set Cache-Control "max-age=1, private, must-revalidate"
</filesMatch>
</ifModule>
Header unset Pragma
Header unset ETag
FileETag None
php_flag apc.cache_by_default On