Já alterei o .htaccess para isto:
### BEGIN .htaccess
# Protect the htaccess file
<Files .htaccess>
Order Allow,Deny
Deny from all
</Files>
# Protect wpconfig.php
<Files wp-config.php>
Order Allow,Deny
Deny from all
</Files>
# Disable directory browsing
Options All -Indexes
# BEGIN COMPRESSION AND CACHING
<IfModule mod_deflate.c>
# Enable compression
AddOutputFilterByType DEFLATE text/css text/javascript application/x-javascript text/html text/plain text/xml image/x-icon
<IfModule mod_setenvif.c>
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
</IfModule>
<IfModule mod_headers.c>
# Make sure proxies deliver correct content
Header append Vary User-Agent env=!dont-vary
# Ensure proxies deliver compressed content correctly
Header append Vary Accept-Encoding
</IfModule>
</IfModule>
<IfModule mod_headers.c>
# No ETags, No Pragma
Header unset Pragma
Header unset ETag
# Default cache time to 1 year (31536000 sec)
Header set Cache-Control "max-age=31536000, public, must-revalidate"
</IfModule>
<IfModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file \.(html?|xml|txt|css|js)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</IfModule>
# No ETags
FileETag none
# CACHE SETTINGS (mod_expires)
<IfModule mod_expires.c>
# Turn on Expires
ExpiresActive On
# set default to "access plus 1 year"
ExpiresDefault A31536000
# html - "modification plus 1 hour"
ExpiresByType text/html M3600
# css and JavaScript - "modification plus 6 weeks"
ExpiresByType text/css M3628800
ExpiresByType text/javascript M3628800
ExpiresByType application/x-javascript M3628800
</IfModule>
# No cache for php-files
<FilesMatch "\.(php)$">
<IfModule mod_expires.c>
ExpiresActive Off
</IfModule>
<IfModule mod_headers.c>
Header set Cache-Control "private, no-cache, no-store, proxy-revalidate, no-transform"
</IfModule>
</FilesMatch>
# END CACHING
# W3 Total Cache are here (automatically included by the plugin):
# WordPress Default Rules are here (at the end of the file):
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
### END .htaccess
Quanto aos plugins, já activei. Falta configurar... ; )