O_O well it is pretty fast but from what I see there's very little use of images. I'm not an expert but by simply using a stylesheet and preloading everything else in another file, your site speed will be affected. I think visually I see only 2 images on the site (there may be more), so in a sense it doesn't have much to load other than the data from the databases. I can make a simple CMS that'd load a bunch of article titles that fast if I only had one image (and good server lol). Probably not a forum though v_v
Same, I gave up on it, even though CloudFlare offers nice service, sexy panel, and such, but the result, at least for my forum, is [really] worse than before (Time to wait increased as hell).
Such a shame, but the site has some good potential depending your server configuration. I like their Rocket Loader (even though it doesn't work well for Xenforo forum), and will miss their security service.