We have done a lot work of optimization, but video transcoding is very cpu consuming, especially 1080P video. We recommend, Video Record should use a lower video resolution(640P/720P,eg), which will make video export much faster than 1080P, with negligible video quality lose.
Video show 3.x is the next generation of Video show with a new video editing engine. Video Show has 16 million users globally, is No.1 video editor in android market. Most recently, Video Show was included in Google's list of Best video editor that make you a superb photographer.