BuddyPress.org

well, you do not even have to log-in !

at the homepage of testbp.org the navigation bars at the very top are extremely slow.

It takes a few seconds to move from “Log In” to “Sign Up” when moving with the mouse….(mouse-over)

then you compare:

go to a specific user-blog, there you will experience the navigation is suddenly behaving very fast.

for example, check those user-blogs (or any others):

http://quicktest.testbp.org/

http://andysblog.testbp.org/