[lysin]

XBMC wiki says that the "O" shortcut "Displays CPU usage & video diagnostic info".

It's the update rate of the GUI on the Pi. Always has been.
Because the GPU renders the video directly xbmc doesn't even know when the video frames render.

On most other plaforms the video is rendered as part of the GUI, so this matches the video frame rate.

Ok.

Thanks for the explanation popcornmix.

Cheers and keep up the good work