1) Long pause is observed when Scan option is selected the first time, subsequence Scan selection responded without much delay. JPA showed that shader compilation is a major contributor to the long lag effect. This compilation is only done once per shader, but the long delay time has negatively impacted to the look and feel of the demo.

2) Long pause is also observed every time user hits the back button when in Scan option. This is mainly caused by images are reload each time it get out of Scan option.This maybe a css issue where there is no caching of loaded images. However a big GC is also noticed after each back operation.