I've run into a problem with a HTML5 video. I use an HTML5 video (MP4 and WebM) to run almost full screen on my website. The video is working fine. It auto-plays the video, and repeats playing. The only thing is: it uses a lot of CPU. I've tested it on 2 MacBooks, and both use about 20-40% of my CPU. My fan is running as fast as it can (6000 rpm). I really don't know what is causing that use CPU usage. The video files are about 32mb big.
The website is: http://atention.sw-dev.nl/ (Written in Dutch).
I really appreciate your help.