The announcement of Android 4.1 at the Google I/O surprised everyone with Project Butter. The curious name says it all: this is a technology aims to make Android device as smooth as milk derivative. According to the information from Google Developers, Android 4.1 is being designed to offer the best performance and lowest latency in touch commands - taking advantage of an easy and intuitive interface. To ensure this improvement, Google is working seriously on the Project Buffer, which is to modify the base software and add some features that will improve response and resource utilization. More to read.
Android’s latest release v4.1 AKA Jelly Bean uses a timed vertical sync (vsync) extended so that the processor can detect everything that happens on the screen. Scanning occurs in 16 milliseconds and ensure that rendering of frames is not anticipated or delayed. The system will use a triple buffering technology for graphics rendering. This means that everything will be smoother, since the scroll on the screen until the animations. Android 4.1 reduces latency in touch commands to sync with vsync and also to predict their movements. The OS forces the CPU to anticipate their actions, ensuring that nothing will result in delays.
Source: Google Developers