I set up W3 Total Cache with all the default settings, but it doesn't seem to be doing anything. Every page loads at the same speed it did before I activated the plugin. All of the folders in /wp-content/w3tc/ are empty, and I believe that's where the cached files are supposed to be stored. Sometimes a feed will show up in /wp-content/w3tc/pgcache if I wait a few hours, but that's it. If I turn on debug mode, I don't see any comments at the bottom of pages. I read the entire faq and install instructions and still can't find out what's wrong. And the compatibility test doesn't seem to be showing any problems either. If someone can help me to get it to work I'd be eternally grateful. Thank you.