Why are my cart, checkout, or receipt pages loading slowly?
The most common cause of slow page loads is a missing image or other asset that’s being cached. You can use the “net” panel of Firebug to diagnose which images might be failing to load. (Hint: It’s usually the image that takes forever to load.)
You can also open in a new tab each cached image that you see in the Net panel. If it’s working you’ll see the image cached. If it’s not you’ll see an error message.
mystylesheet.css when you meant to link to
my_stylesheet.css. When FoxyCart’s automagicache caches your template it pulls in the HTML from a big ol’ 404 error page rather than the CSS or JS file you were expecting.