Empieza con este y vas probando,,,,,, de momento ganaras velocidad y alguna cosa más. Debes tener los módulos requeridos activados.
Código :
Ver originalRewriteCond %{HTTP_USER_AGENT} libwww-perl.*
RewriteRule .* – [F,L]
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
<ifModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/html text/xml text/css text/plain
AddOutputFilterByType DEFLATE image/svg+xml application/xhtml+xml application/xml
AddOutputFilterByType DEFLATE application/rdf+xml application/rss+xml application/atom+xml
AddOutputFilterByType DEFLATE text/javascript application/javascript application/x-javascript application/json
AddOutputFilterByType DEFLATE application/x-font-ttf application/x-font-otf
AddOutputFilterByType DEFLATE font/truetype font/opentype
</ifModule>
<ifModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 300 seconds"
ExpiresByType text/html "access plus 600 seconds"
ExpiresByType image/gif "access plus 604800 seconds"
ExpiresByType image/ico "access plus 604800 seconds"
ExpiresByType image/jpeg "access plus 604800 seconds"
ExpiresByType image/jpg "access plus 604800 seconds"
ExpiresByType image/png "access plus 604800 seconds"
ExpiresByType text/css "access plus 604800 seconds"
ExpiresByType text/javascript "access plus 604800 seconds"
ExpiresByType application/x-javascript "access plus 604800 seconds"
ExpiresByType application/javascript "access plus 604800 seconds"
ExpiresByType application/xhtml+xml "access plus 600 seconds"
</ifModule>
<ifModule mod_headers.c>
Header set Connection keep-alive
<filesMatch "\\.(ico|pdf|flv|jpg|jpeg|png|gif|svg|swf)$">
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