As you move from page to page through the forum, there's a noticeable delay before the menu bar/tabs re-appear. I think it exists with the footer as well, but that's not as noticeable.
It happens on the default style and my slightly customized style.
The VPS is fairly low end (Xeon 3.2, 1GB RAM), but performance otherwise seems reasonable.
Apache, PHP 5.3, APC caching.
Any suggestions on how to track this down? It isn't a huge issue, but it is irritating.
The site is TNOutdoorForum.com if you want to take a look. It's a bit hideous since I haven't changed the colors from the xenforo defaults yet.