Is the link in the signature, your site?
Need to know the site so I can run the test and give you a analysis.
Usually when I see FBT a problem it is a fat site, loading more than 1.5 MB on browsers, with lots of un-optimized images, and so on. There is no one "THE" way to fix that... No magic bullet. You need to optimize your site, is my educated guess.
But until I can see test results I'm not much help beyond that.
EDIT: If the site in your sig is the problem site, the first thing you need to do is get rid of the custom font files you are loading on browsers. It is about 30% of your total pageload and really does nothing for you, since most browsers ignore the custom fonts anyway.
SiteTestResults