The partial image isn't a CPU usage issue. DriveLine isn't reading all of the image data out of the MP3 when the tags are version 2.3 or higher.
I'll see what I can do about a setting for disabling the visualizations, and auto-hiding audio sources that are not available. Up until a month ago, there was no radio support at all, so the only audio source was local media, and having the playlist separate was fine. Now, it would make more sense to put it under Now Playing. And I've been thinking about it. It's an easy request. The trick is just finding a location for the button. And maybe a prettier icon. Right now, the icon for Playlist is pretty large, and has a caption underneath it. Moving it into the Now Playing window will probably mean getting rid of the caption and "metro" style of it.
I appreciate the feedback. Especially since most of it was stuff I was already considering. I'm glad it sounds like things are working well, and it's just a matter of moving some things around, and hiding some things when not required.