Voici ce que j'ai trouvé, et qui semble fonctionner puisque cela a amélioré le pagespeed Insights de mon site :
Test de la page : http://developers.google.com/speed/pagespeed/insights/" rel="nofollow - https://developers.google.com/speed/pagespeed/insights/
1- Autoriser la compression gzip
---> OE / Projet / htaccess : ajouter une commande / Script libre
# 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
2 - Contrôle du cache navigateur :
---> OE / Projet / htaccess : ajouter une commande / Script libre
# contrôle du cache navigateur - Expire headers
<IfModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 7200 seconds"
ExpiresByType image/jpg "access plus 1 week"
ExpiresByType image/jpeg "access plus 1 week"
ExpiresByType image/png "access plus 1 week"
ExpiresByType image/gif "access plus 1 week"
AddType image/x-icon .ico
ExpiresByType image/ico "access plus 1 week"
ExpiresByType image/icon "access plus 1 week"
ExpiresByType image/x-icon "access plus 1 week"
ExpiresByType text/css "access plus 1 week"
ExpiresByType text/javascript "access plus 1 week"
ExpiresByType text/html "access plus 7200 seconds"
ExpiresByType application/xhtml+xml "access plus 7200 seconds"
ExpiresByType application/javascript "access plus 1 week"
ExpiresByType application/x-javascript "access plus 1 week"
ExpiresByType application/x-shockwave-flash "access plus 1 week"
</IfModule>
## Mise en cache cache-control
<IfModule mod_headers.c>
<FilesMatch "\\.(ico|jpe?g|png|gif|swf)$">
Header set Cache-Control "max-age=2592000, public"
</FilesMatch>
<FilesMatch "\\.(css)$">
Header set Cache-Control "max-age=2592000, public"
</FilesMatch>
<FilesMatch "\\.(js)$">
Header set Cache-Control "max-age=2592000, private"
</FilesMatch>
<FilesMatch "\\.(x?html?|php)$">
Header set Cache-Control "max-age=600, private, must-revalidate"
</FilesMatch>
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