Hi Friends, i guess i found a lightwight solution to display the hardware supported MJPEG Stream from the rpi cam. Please check this link:
The link are in german, but i think you can translate this via google. This guy use a special version of mjpg_streamer (GitHub - jacksonliam/mjpg-streamer: Fork of http://sourceforge.net/projects/mjpg-streamer/) and access direct to the rpi cam. The cam themself encode the video stream to mjpeg and the streamer deliver this only to a browser. My CPU last are ~5% with 30fps and 1240x720 pixels