You have to be careful with the lazy loading, sometimes it ends up being just more round trips. And then there are those annoying sites that refuse to load anything that is off screen, and you end up having to wait over and over again.
Those are the cursed sites! Not only you have to wait for content you want, but you always get content you DON'T want just when you're about to finish your reading. Then - BAM! - page starts lagging, twitching, spitting out another megabytes worth article you didn't ask for.