It just happens with 2 of the vis themes. On the others the CPU usage is at 45-53% .
You don't have the video/dvd playback code implemented yet but you should try to optimise it since it is crucial for low powered systems like the M10000. You may have to use PowerDVD's codec (or at least ask users to have it pre-installed) since it is the only one which utilises the hardware DXVA acceleration feature of the EPIA's.
As for DivX I found that the 5.1.1 version of the codec is the most "EPIA" friendly. :)
btw you should ask Zip-Lock to make the bug report and the feature request threads sticky so that they don't float around ;)