You may have read a previous post about "Android Top", an my experiments about custom widget creations.
Well, here in this sample video you can find a rather funny animation when you long touch on the VU Meter face.
This is shown in the emulator and that's why CPU usage increases so high when the animation takes place.
PS: I need to find a better image for VU Meter's back. If you have one to contribute it's gladly welcome.