Why does pluralistic load so fast?

I visit a bunch of sites routinely, and none of them load like Cory's. Some of the slowest tell me they are dealing with security to determine I'm a human. Others appear to be doing the same based on what I can interpret from the chyron in the bottom left.

Is it really that all of these sites are doing some kind of fucky shit and my various blockers are intercepting it? If all websites were honest, would they all load as fast as pluralistic.net?