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crookedvulture writes "Much has been made of Project Butter, the interface responsiveness improvements built into Android 4.1 Jelly Bean. Google tweaked the OS to better sync up with the 60Hz refresh rate of typical displays. It also implemented triple buffering to ensure smooth frame delivery. Critics have lauded the results, which this Nexus 7 reviewcaptures on a high-speed camera. The Nexus' UI is clearly much smoother than tablets running Ice Cream Sandwich. Google seems to be addressing one of Android's biggest weaknesses versus iOS." Link to Original Source
It is masked but always present.
I don't know who built to it.
It came before the first kernel.