Audio only stutter

[mrpi]

Hello,

I have updated to the latest stable and now the video playback works great. (Nice work guys!) The video stutter totally disappeared, even while the RPi is downloading or working with large files.
My problem (which I had before too) is that if I try to listen to any audio only source (local mp3, shoutcast etc.) playback will stutter if the RPi is doing anything else or even if I go through the menus.
The setup is described in my profile.

How come audio playback has problems, while audio+video works really well?!

Thanks,
Alex