The moviecasting uses lots of CPU. Why?
A. The moviecasting takes the file at it is, and it tries to broadcast with the original size and framerate. The only transformation is to convert the file in something called H263/RTP. If the resolution of the movie is high and it has lots of frames per second, then the transmission will use lot of CPU and bandwidth. As was mentioned, this is one of the less mature features of Agora.