I installed WP Super Cache and it significantly reduces the TTFB comparing to W3 Total Cache. However, I got following messages when I test my webpage:
FAILED - (No max-age or expires) - http://cdn.geoadvanced.com/wp-content/uploads/2013/07/photo-2.jpg
In WP Super Cache Settings, there is a message saying: Mod rewrite may not be installed! However, I updated Mod Rewrite Rules and the contents in .htaccess file are exactly the same as shown after updating Rewrite rules. How to fix this problem?