Can I ask what fps it was running at when you were idle, away from any gadgets ?. If it was 60fps, what are your pc specs.
That was the idle FPS.
PC:
P4 2ghz
GeForce 3 ti200
SoundBlaster Live! Value
512mb DDR RAM
Those're the only things I think would affect the actual FPS outside of the actual internals of drawing the GUI.
Anyhow, I expect the slowdown is not only due to the drawing of the rather large window images (buffers, blocks, etc.) but also some general areas handled by the code. In any case, I do like the work you've done on it.